单项选择题

It's hard to confirm or refute that there's a causal relationship between the amount of fat we eat and the of heart attacks.

[A] incidence
[B] impetus
[C] momentum
[D] emergence

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单项选择题

By the end of next month we ______ the review on the research findings.

[A] will finish
[B] will be finishing
[C] will have finished
[D] have finished

单项选择题

The dean of our department is supposed ______ for Florence the day before yesterday.

[A] to leave
[B] to have left
[C] to be leaving
[D] to have been left

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