Please wait _______ the elevator door to close automatically in order to conserv

游客2025-06-16 2

问题 Please wait _______ the elevator door to close automatically in order to conserve energy.

选项 A、of
B、for
C、by
D、until

答案 B

解析知道wait for这个固定搭配就能答对此题。锦上添花，再多记～点：这里for后面的词是to不定式的主语。

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Pleasewait_______theelevatordoortocloseautomaticallyinordertoconserv