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
It was not until he closed the door ______ he ______ he forgot to take the keys with him.
A．that, realized
B．did, realize
C．which, realized
D．when, realized
单项选择题
A series of seminars ______ scheduled.
A．has
B．is
C．/
D．are
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