单项选择题
A.must
B.should
C.need
D.have to
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单项选择题
A.unhappyB.illC.healthyD.comfortable
A.unhappy
B.ill
C.healthy
D.comfortable
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单项选择题
A.aboutB.onC.toD.at
A.about
B.on
C.to
D.at
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