单项选择题

Your mother has been ______ about you so much. Please don't worry her any more.

[A] worried
[B] worry
[C] to be worried
[D] to worry

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单项选择题

—Excuse me, have you ever been to Switzerland —______. But many people say it's a very beautiful country.

[A] No, i don't
[B] Sorry, I can't
[C] No, never
[D] Yes, I hope to

单项选择题

—How long did the meeting last this afternoon —It was supper time ______ the meeting was over.

[A] that
[B] at which
[C] when
[D] until

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