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

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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
单项选择题
We believe that the younger generation will prove （） of our trust.

A.worthwhile
B.worthy
C.worth
D.worthless
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