单项选择题
A.ought to
B.may
C.used to
D.need
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单项选择题
A.accidentB.conditionC.incidentD.disaster
A.accident
B.condition
C.incident
D.disaster
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单项选择题
A.beforeB.sinceC.whenD.while
A.before
B.since
C.when
D.while
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