单项选择题
A.if
B.because
C.that
D.when
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单项选择题
A.veryB.likeC.usuallyD.often
A.very
B.like
C.usually
D.often
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单项选择题
A.uselessB.necessaryC.rightD.hard
A.useless
B.necessary
C.right
D.hard
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