单项选择题

(However good) (are my paintings), I am (conscious) that they may (leave) much to be desired.

A. However good
B. are my paintings
C. conscious
D. leave
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You should (check) the air in the (tires) (as) you (start on) a long automobile trip.
A. check
B. tires
C. as
D. start
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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