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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In earlier days, local trade was（）more important.

A、 many
B 、very
C、 much
D、 too
单项选择题
No sooner had he reached the top of the hill（）he sat down to rest.

A、then
B、than
C、until
D、when
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