单项选择题

Was it five o'clock ______ the fire broke out

A. when
B. that
C. which
D. in which
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单项选择题
—He hasn't gone to the office up to now. —Well, he ______.
A. should
B. ought to
C. ought to go
D. ought to have
单项选择题
Was it under the tree ______ you were away talking to a friend Sure. But when I got back there, the bike was gone.
A. that
B. where
C. which
D. while
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