单项选择题

The waterfall()the rocks.

A. wears down
B. wears off
C. wears away
D. wears out

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单项选择题
It was last summer () we were invited to his birthday party.

A. that
B. when
C. than
D. who
单项选择题
— Would you mind my telling him the news().

A. Yes, please
B. Never mind
C. It doesn't matter
D. No, go ahead
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