单项选择题

Until then, his family ______ from him for six months.

A. didn't hear
B. hasn't been hearing
C. hadn't heard
D. hasn't heard
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I ______ the train but I overslept that morning.
A. could catch
B. might catch
C. must have caught
D. could have caught
单项选择题
______ I really don't like art, I find his work impressive.
A. As
B. Since
C. If
D. While
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