All flights owing to the heavy fog, many passengers could do nothing but take trains.

A. to be cancelled

B. were cancelled

C. have been cancelled

D. having been cancelled

 

D

【解析】

試題分析:句意：由于大霧，所有的航班都被取消了，很多乘客只能乘坐火車。句中沒有連詞，而且兩部分之間是逗號(hào)，由此判斷是獨(dú)立主格形式，即：名詞或代詞+ to do / doing /done ，排除BC選項(xiàng)。根據(jù)句意可知航班被取消發(fā)生在主句謂語動(dòng)詞之前，應(yīng)該用非謂語的完成式，而不定式表示將來，故答案選D。

考點(diǎn)：考查獨(dú)立主格

 

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