单项选择题

The thought （）he might be a scientist some day encouraged him to study hard.

A. whether
B. that
C. how
D. why

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单项选择题
No matter how hard he worked, （）

A. he could not do any better
B. and he could not do any better
C. so he could not do any better.
D. but he could not do any better
单项选择题
He （） an expensive gift on his birthday, but he didn't （）it.

A. accepted... received
B. receive... accept
C. received... accept
D. got... receive
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