单项选择题

You look tired, ______ don't you have a rest

[A] Why
[B] What
[C] How

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单项选择题

—She sometimes ______ in to talk to Jeff in the coffee shop. —Does she

[A] came
[B] has come
[C] comes

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I know a lot of parents are worried ______ their children watch TV all the time.

[A] though
[B] because
[C] before

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