单项选择题

Tom （） better than to ask Dick for help.

A. shall know
B. shouldn’t know
C. has known
D. should have known

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单项选择题
Not until science became prominent （） be abolished , some people argue.

A. did slavery come to
B. slavery to
C. had slavery come to
D. that slavery came to
单项选择题
Jane was advised that she （） singing lessons.

A. take
B. will take
C. had taken
D. took
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