单项选择题

I waited for him half an hour, but he never ______.

A．turned in
B．turned down
C．turned off
D．turned up
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单项选择题
______ in this way, the situation doesn't seem so disappointing.
A．To look at
B．Looking at
C．Looked at
D．Look at
单项选择题
Don't let the child play with knives ______ he cuts himself.
A．so that
B．now that
C．only if
D．in case
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