The patient suffering from a cough soon found ______ to give up smoking.A、it is

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问题 The patient suffering from a cough soon found ______ to give up smoking.

选项 A、it is necessary
B、necessary
C、it necessary
D、that necessary

答案 C

解析 it在句中是形式宾语，代替不定式短语to give up smoking。

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【B1】[br]【B19】A、sufferB、sufferersC、sufferingD、suffererBThey和该空所要填的词为对等关系，因此