He had more dictionaries than____for his work.

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问题 He had more dictionaries than____for his work.

选项 A、they are needed
B、it was needed
C、were necessary
D、necessary were they

答案C

解析 than后的从旬主语若是主句中提到的名词,谓语是动词be时,可以省略从句的主语,有时be也略而不用。此句实际上是省略了主语they(the dictionaries)。
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