单项选择题

Smith will be ______ engineer next month.

A. a
B. the
C.an
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单项选择题
I ______ housework when there was a knock at the door.
A. did
B. was doing
C. am doing
单项选择题
Mrs. White bought ______ of meat.
A. a half kilo
B. half kilo

C. half a kilo
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