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
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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
单项选择题
—Isn't that Ann's husband over there—No, it______be him. I'm sure he doesn't wear glasses.
A．can't
B．must not
C．won't
D．may not
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