单项选择题

He _____ his homework when his mother came back yesterday evening.

A) was doing
B) is doing
C) did
D) does
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单项选择题
It took me a year to be _____ to the college life.
A) adapted
B) adopted
C) received
D) accepted
单项选择题
Every knife and fork _____ carefully.
A) have cleaned
B) has cleaned
C) have been cleaned
D) has been cleaned
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