单项选择题

The teacher demanded that the students （） from speaking while the class is in progress.

A.avoid
B.refrain
C.stop
D.control

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单项选择题
The product was attacked when it was first（） , but gradually it was accepted.

A.advanced
B.occurred
C.appeared
D.challenged
单项选择题
We like to read the book （） .

A.subject of which we know well
B.its subject we know well
C.whose subject we are familiar with
D.whose subject we are familiar
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