If our budget for office supplies _______, all new requests for them will have to be approved on a case-by-case basis.

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问题 If our budget for office supplies _______, all new requests for them will have to be approved on a case-by-case basis.

选项 A、is exhausting
B、are exhausting
C、is exhausted
D、will be exhausted

答案C

解析 空格内应填入动词的单数形式。以ex-开头的动词是及物动词。没有宾语则应使用被动语态,也就是选择C或D选项。最后,要掌握时间、条件状语从句的用法。
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