13 they are still called “phones”—a word meaning “voice” in Greek—making voice calls may no longer be their primary function.
答案：(B) Even if
Even if（即使）引導讓步子句，表示「即使手機仍被稱作『phone』（希臘文原意是聲音），但打電話可能已不再是主要功能」，符合「即使∼但∼」的讓步邏輯（此為官方確認修正：原誤植為 As long as，正確答案為 Even if）；As long as（只要）為條件關係，語意不合；Just as（正如）、Only when（只有當）皆不符合此處的讓步轉折。
四個選項都是從屬連接詞、後面都接子句，形態上刷不掉，你會一個一個代進去讀。
這是邏輯勾環：要判斷的是兩個子句之間的邏輯關係。先把兩邊講的事讀清楚：空格後的子句是 they are still called “phones”（它們仍然被叫做「電話」，而 phone 這個字在希臘文裡就是「聲音」）；主要子句是 making voice calls may no longer be their primary function（打語音電話可能不再是它們的主要功能）。名字還叫電話，功能卻不再以講電話為主——兩邊語意相反，這就是讓步關係，用 Even if（即使、縱使）。填進去讀成 Even if they are still called “phones,” making voice calls may no longer be their primary function。
As long as（只要）是條件，會讀成「只要還叫電話，打電話就不再是主要功能」，前後成了因果，說不通；Just as（正如、就像）要求前後是相似的類比，但這裡兩邊相反；Only when（只有當……時）也是條件，而且放句首時主要子句一定要倒裝，本句沒有倒裝，形態上就先出局——先看主要子句有沒有倒裝，比慢慢想語意快得多。
even if（即使、縱使）、even though（雖然，用於既成事實）、as long as（只要）、just as（正如、就像）、only when ＋ 主要子句倒裝（只有當……時）、primary function（主要功能）。
The telephone is widely considered as the most rapidly evolving technological device today. Many experts in the field believe that future phones will not only look very different—they may not even be 11. They may be hidden in jewelry or accessories, or even embedded in the body. They will undoubtedly have a lot of additional features and 12 functions, and users may interact with them in new ways, too.
13 they are still called "phones"—a word meaning "voice" in Greek—making voice calls may no longer be their primary function. With advances in contemporary design and technology, the phones may 14 remote controls, house keys, Game Boys, maps, flashlights, health monitors, recorders, handguns, and so on.
15, they will be "the remote-control for life."