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
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单项选择题
Valentine’s Day _______.
A． comes once a year
B． is on February 14th
C． comes twice a year
单项选择题
We can know from the passage that valentines refer to(涉及) ________.
A． mothers and fathers
B． cards, flowers, candy and so on
C． teachers and students
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