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
（）with the size of the whole earth, the highest mountain does not seem high at all.

A. When compared
B. When comparing
C. Compare
D. Comparing
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