Once the questions are finished, the examiner analyzes the results to determine if the person tested 24 truthful.
答案：(A) was being
was being truthful 用 be 動詞的進行式，表示「當時（測謊進行時）是否說實話」這個一時的行為表現；would be（對未來或假設的推測）、was to be（命中注定、預定要）、would have been（與過去事實相反的假設）都與當下的實際表現無關。
答對率 26%。
你腦中的 be 動詞只有「是」，後面接形容詞就結束了（He was truthful.）；很少人學過 be 動詞也能用進行式。看到 was being truthful，第一反應是「be 動詞怎麼會有進行式」。
進行式把時間框在當下那一刻，講的是行為，不是本質。He is rude.（他這人很無禮）≠ He is being rude.（他此刻的舉止很無禮）。本題要判定的是受測者「測謊當下」有沒有說實話，不是評斷他一輩子誠不誠實，所以用 was being truthful。
Once the questions are finished（問題問完之後）與 the examiner analyzes the results（檢驗人員分析結果）標出兩個時間點：分析在測謊之後，要回頭判斷「測謊進行時」的表現——這個時間差正是進行式的立足點。
You are being silly.（你現在很幼稚）、Don't be silly.——國中其實見過，只是沒特別點明。
be being + 形容詞（一時的表現）、tell the truth（說實話）、a lie detector／polygraph test（測謊器）。
A polygraph machine, also known as a "lie detector," is a common part of criminal investigations. The instrument is used to measure 21 a person's body reacts to questions. The theory underlying it is that lying is stressful, and that this stress can be measured and recorded on a polygraph machine.
When a person takes a polygraph test, four to six wires, called sensors, are 22 to different parts of his body. The sensors pick up signals from the person's blood pressure, pulse, and perspiration. 23 the process of questioning, all the signals are recorded on a single strip of moving paper. Once the questions are finished, the examiner analyzes the results to determine if the person tested 24 truthful.
Well-trained examiners can usually detect lying with a high degree of 25 when they use a polygraph. However, because different people behave differently when lying, a polygraph test is by no means perfect.