单项选择题

Betty's parents have lived in this city ______ five years.

[A] for
[B] since
[C] in
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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
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
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