单项选择题
A.haven’ t to
B.don’ t have to
C.must not
D.don’ t need
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单项选择题
A.worthB.practiceC.importanceD.value
A.worth
B.practice
C.importance
D.value
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单项选择题
A.busyB.tiresomeC.crowdedD.quiet
A.busy
B.tiresome
C.crowded
D.quiet
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