问题
选择题
The telephone rang but I didn’t hear it. I _________ asleep.
A．must be
B．ought to have been
C．should be
D．must have been
答案
答案：D
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The telephone rang but I didn’t hear it. I _________ asleep.
A．must be
B．ought to have been
C．should be
D．must have been
答案：D