问题 选择题

Jim couldn’t understand how the machine worked until his friends____ how to use it.

A.promised

B.explained

C.thought

D.heard

答案

答案:B

考查词义辨析。promised 答应,允诺,explained解释,thought认为,heard听到,句意:吉姆不明白这台机器如何工作直到它的朋友们解释了如何使用。所以选B。

选择题
判断题