单选题
It was when their house had been buried in snow______some idea about the seriousness of the situation.
A、
that they had
B、
had they
C、
that did they have
D、
did they have
【正确答案】
A
【答案解析】
解析：句意：当他们的屋子快被埋到雪里时，他们才意识到情况的严重性。本句是强调句型，除了被强调的内容是人以外，其他情况都用it is…that…的形式，that后面接被强调的内容。故本题答案为A。
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