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If you want to join the tour, ( ) to hand in the photocopy of your passport by next Wednesday.
A.forget
B.ensure
C.be sure
D.unsure

A.A.forget
B.ensure
C.be
B.unsure

【参考答案】

B
解析:句意:如果你想参加这场旅行,请确保下周三之前提交护照的复印件。根据句意,首先排除A和D,然后“be s......

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