单项选择题

She has been working in this factory ().

A. in 1980
B. after 1980
C. since 1980
D. until 1980

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单项选择题
Mr. Smith drove slowly on the way home until he reached the highway, () the speed limit was 60 miles an hour.

A. where
B. though
C. when
D. because
单项选择题
I'm going to have my letters () tomorrow.

A. type
B. typing
C. typed
D. to be typed
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