单项选择题

It ____ around nine o'clock when I drove back home because it was already dark.

A．had to be
B．was to be
C．must be
D．must have been
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单项选择题
My wife said in her letter that she would appreciate ____ from you sometime.
A．hearing
B．to hear
C．having heard
D．to have heard
单项选择题
Our teacher recommend that we ____ as attentive as possible when we visit the museum.
A．are
B．be
C．were
D．shall be
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