单项选择题

By improving reading skills, you can read faster and understand more of （）you read.

A. that
B. what
C. which
D. whether

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单项选择题
I was really anxious about you. You（）home without a word

A. mustn't leave
B. shouldn't have left
C. couldn't have left
D. needn' t leave
单项选择题
Please return in an hour. I'll be ready （） then.

A. till
B. by
C. at
D. on
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