单项选择题

There're so many kinds of radios on sale that I can't make up my mind ______ to buy.

[A] what
[B] which
[C] how
[D] where
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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
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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