Over the course of an 80-year life span, the odds of being hit by lightning are 1 in 3,000, 21 the probability of being struck seven different times.
答案：(C) not to mention
【句型】not to mention 字詞搭配「更不用說」，表示「機率是三千分之一，更不用說被擊中七次的機率」；if it isn't、as you can see（如你所見）、with regard to（關於）都不合。
not to mention 拆開看是「不要提到」，很容易誤讀成「別說了」。它其實是一個固定片語，意思正好相反：更不用說、更別提，用來追加一件比前面更誇張的事，語氣是「前面那個已經夠驚人了，後面這個還更誇張」。
前半句給了一個數字：the odds of being hit by lightning are 1 in 3,000（被閃電擊中的機率是三千分之一）。空格後接 the probability of being struck seven different times（被擊中七次的機率）。一次就已經很罕見，七次當然更罕見——這正是 not to mention 的語氣。而且它後面接名詞片語、不接完整句子，本句 the probability of... 剛好是名詞片語，句構也吻合。
if it isn't 在此語意與句構都不成立；as you can see（如你所見）用來提醒對方注意眼前的事物，本句是在陳述數據，沒有東西可以「看」；with regard to（關於）只是帶出話題，讀起來變成「關於被擊中七次的機率」，接不上前面的數字，也失去了對比的力道。
not to mention ＋ 名詞（更不用說……）、let alone（更別提，多用於否定句之後）、the odds of（……的機率）、1 in 3,000（三千分之一）、the probability of（……的可能性）、with regard to（關於）。
Being hit by lightning is a rare event. Over the course of an 80-year life span, the odds of being hit by lightning are 1 in 3,000, 21 the probability of being struck seven different times. Roy Sullivan, a park ranger in the United States, was struck by lightning more recorded times than any other human being. Over his 36-year career, Sullivan was struck by lightning seven times—and 22 each shock!
Strikes one, two, and three were pure bad luck, he thought. But after strike four, Sullivan became 23 death and took precautions during lightning strikes. Strike five occurred in 1973 when Sullivan was on patrol. A storm cloud "chased" him until he was struck. The same thing happened again in 1976. Sullivan, while surveying a campground, felt that a cloud was 24 him, and tried all he could to run— but it got him anyway.
Finally, on 25 June 1977, a seventh and final bolt struck Sullivan as he was fishing in a pond. "I don't believe God is after me," he theorized. "If he was, the first bolt 25 enough. Best I can figure is that I have some chemical, some mineral, in my body that draws lightning. I just wish I knew."