单项选择题


A．in
B．up
C．on
D．down
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单项选择题
A．won't eatB．mustn't eatC．did not eatD．have not eaten
A．won't eat
B．mustn't eat
C．did not eat
D．have not eaten
单项选择题
A．whenB．butC．becauseD．then
A．when
B．but
C．because
D．then
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