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强调句20.It was ____that caused him to serve dinner an hour lat

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强调句20.It was ____that caused him to serve dinner an hour later than usual.
A.we being late
B.our being late
C.we were too late
D.because we were late
why
强调句20.It was ____that caused him to serve dinner an hour lat
强调句的it is 后要是一个短语,不能是一个句子.
A.we being late 不是一个有效的短语,
B.our being late 是动名词的复合结构,相当于一个名词,符合要求.
C.we were too late 是一个句子,不符合要求
D.because we were late 也是一个句子,不符合要求