单项选择题

(Hard) (as) he worked, (but) Mr. Black couldn't keep the shop (properly).

A. Hard
B. as
C. but
D. properly
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单项选择题
Yellow Stone National Park is (one) of the (older) parks in the U.S. It (was established) by (Congress) in 1872.
A. one
B. older
C. was established
D. Congress
单项选择题
Since her blood pressure is (much) higher (than) (it should be), her doctor insists that she (will) not smoke.
A. much
B. than
C. it should be
D. will mot
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