单项选择题

I was really anxious about you. You______home without a word.

A．mustn't leave
B．shouldn't have left
C．couldn't have left
D．needn't leave
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单项选择题
We haven't heard from Jane for a long time. What do you suppose ______ to her
A．to happen
B．has happened
C．is happened
D．happening
单项选择题
He had to ______ his studies through lack of money.
A．give back
B．give away
C．give in
D．give up
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