单项选择题

You can't decide whether you like something ______.

A．even if you have tried it
B．although you have tried it
C．before you have tried it
D．when it has been tried several times
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单项选择题
From this passage we know that to find oneself is ______.
A．important
B．natural
C．unnecessary
D．quite easy
单项选择题
The streets are all wet. It ______ last night.
A．must be raining
B．must have been mining
C．had to rain
D．must have rained
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