问题
单项选择题
It（）aroundsixo’clockwhenIdrovebackyesterdaybecauseitwasalreadydark.
A.must have been
B.must he
C.was to be
D.had to be
答案
参考答案：A
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It（）aroundsixo’clockwhenIdrovebackyesterdaybecauseitwasalreadydark.
A.must have been
B.must he
C.was to be
D.had to be
参考答案：A