单项选择题

His parents asked him to buy books（）he found useful and necessary for his study.

A. whichever
B. whatever
C. whenever
D. however

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单项选择题

I（）a letter from my sister yesterday.

A. accepted
B. received
C. took up
D. excepted

单项选择题

Please listen carefully while others（）

A. speak
B. speaking
C. spoken
D. spoke

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