单项选择题

In his ______ to further his knowledge of the universe, man has now begun to explore space.

A．attempt
B．expedition
C．trial
D．chase
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单项选择题
You should have put the milk into the refrigerator, I expect it ______ bad by now.
A．went
B．had gone
C．has gone
D．goes
单项选择题
I don't know you want to keep the letter. I've ______ it up.
A．cracked
B．torn
C．broken
D．disposed
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