单项选择题

The fisherman began to pull the rope ______.

A． when there was a fish
B． after he finished throwing it
C． when it became very heavy
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单项选择题
He did not notice the boat began to sink because ______.
A. he was thinking of money and was too happy
B. he was very tired
C. he went on pulling the hooks
单项选择题
Valentine’s Day _______.
A． comes once a year
B． is on February 14th
C． comes twice a year
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