单项选择题

Only after a baby seal is pushed into the sea by its mother______to swim.

A．how will it learn
B．it will learn how
C．will it learn how
D．and it will learn how
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单项选择题
Generally speaking, the harder one works, ______.
A．the better he gets result
B．the better result he gets
C．he gets better result
D．does he get better result
单项选择题
Everybody was looking for you when the meeting was over. You______with-not a word.
A．mustn't leave
B．shouldn't have left
C．couldn't have left
D．needn't leave
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