单项选择题

The effect of the medicine, ______ we had expected, was quite encouraging.

A. which
B. that
C. as
D. what
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单项选择题
Please be careful when you are drinking coffee in case you ______ the new carpet.
A. crash
B. pollute
C. spot
D. stain
单项选择题
In 1776 the United States announced the Declaration of Independence to ______ from the British Empire and became an independent country.
A. pull down
B. break away
C. get off
D. drop off
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