单项选择题

While they were away on vacation, they allowed their mail to （）at the post office.

A.be delivered
B.pile up
C.get lost
D.be returned

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单项选择题
What Marx（）by a particular society was an organization of people making a living together.

A.said
B.argued
C.explained
D.meant
单项选择题
Your gestures need to accompany and （）what you are saying.

A.enforce
B.reinforce
C.rotate
D.transfer
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