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

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Jane was advised that she （） singing lessons.

A. take
B. will take
C. had taken
D. took
单项选择题
San Francisco is usually cool in summer, but Los Angeles （）.

A. is rarely
B. is scarcely
C. hardly is
D. rarely is
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