单项选择题

When spring comes, the trees are ______.

A．in a flower
B．in flowers
C．in the flower
D．in flower
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单项选择题
I wish to invite you to dinner tonight, ______ I
A．shall
B．may
C．don't
D．would
单项选择题
They are put to work when young, and they stay ______.
A．to
B．down
C．up
D．put
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