单项选择题

It is so heavy that it can only be lifted with our () effort.

A. joint
B. equal
C. able
D. capable

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单项选择题
The plan had been (), which made him very angry.

A. called off
B. called up
C. called in
D. called on
单项选择题
()at such a time, his work attracted much attention.

A. Publishing
B. Being published
C. Published
D. When published
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