Question

The young couple, who returned my lost wallet, left _______ I could ask for their names.

A．while

B．before

C．after

D．since

Answer 1

B

試題分析：考查狀語從句。before的基本含義是“在……之前”，又可以根據不同語境靈活翻譯成“才”、“還沒來得及就……”、“趁……”、“就”等，與情態動詞can/could連用， 這時候從句雖為肯定形式，根據漢語表達習慣譯成“還沒來得及就”，如： Before I could get in a word，he had measured me. 我還沒來得及插話他就為我量好了尺寸。While在……期間，當……時候；after在……之后；since自從。故選B。