单项选择题

When ______ why he came in without permission, he stared at us, saying nothing.

[A] asking
[B] asked
[C] being asked
[D] to be asked
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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
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
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