单项选择题

When the farmer came back from work, his pet dog jumped out______the door to welcome him.

A. from
B. from behind
C. of
D. of behind
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单项选择题
I once heard him______that a rainbow (彩虹) was a bridge from earth to heav-en.
A. said
B. say
C. to say
D. was saying
单项选择题
______the essay a second time, the hidden meaning will become clearer to you.
A. While reading

B. After reading
C. Your having read

D. When you read
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