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如何用R命令读取文本数据和Excel数据？

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The reason for my refusal is ______ you are undependable.

A. because
B. that
C. due to
D. for

I’m considering to the Yellow Mountain. Do you consider it a good idea there?

A. going, to go
B. going, going
C. to go, to go
D. to go, going

We will never ______ to force.

A. produce
B. agree
C. afraid
D. yield

Please wait for me the corner 3 o’clock.

A. in, at
B. at, on
C. in, for
D. at, at