单项选择题

Variables such as individual and corporate behavior ______ nearly impossible for economists to forecast economic trends with precision.

[A] make
[B] make it
[C] making
[D] makes it

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单项选择题

We ______ but we forgot his telephone number.

[A] might have called him
[B] would call him
[C] called him ______
[D] should call him

单项选择题

The actress wanted a hat to ______ her dress.

[A] go by
[B] go through
[C] go out
[D] go with

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