It（）aroundsixo’clockwhenIdrovebackyesterdaybecauseitwasalreadydark.<br>A:must have been<br>B:must he<br>C:was to be<br>D:had to be

It（）aroundsixo’clockwhenIdrovebackyesterdaybecauseitwasalreadydark.
A:must have been
B:must he
C:was to be
D:had to be

出自：外经贸英语

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