问题
单项选择题
It ( ) around six o'clock when I drove back yesterday because it was already dark.
A．must have been
B．must be
C．was to be
D．had to be
答案
参考答案：A
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It ( ) around six o'clock when I drove back yesterday because it was already dark.
A．must have been
B．must be
C．was to be
D．had to be
参考答案：A