单项选择题

Don't ______. You'll cross the bridges when you come to them.

[A] have worry
[B] be worried
[C] worry
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单项选择题
Tom is careless; he doesn't remember ______.
[A] where his keys are
[B] where are his keys
[C] his keys are where
单项选择题
—Did you remember ______ Ann —Oh no, I completely forgot.
[A] to phone
[B] phoning
[C] phone
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