单项选择题
A) if C) whether
B) unless D) that
A.if
B.unless
C.whether
D.that
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单项选择题
A) valuable C) unusualB) important D) serious
A.valuable
B.important
C.unusual
D.serious
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单项选择题
A) carrying C) fetchingB) taking D) bringing
A.carrying
B.taking
C.fetching
D.bringing
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