单项选择题
In the advanced reading course students must take tests at monthly ______.
A．distance
B．length
C．periods
D．intervals
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单项选择题
Make sure to ______ the children ______ swimming in the dirty river.
A．protect, from
B．keep, from
C．avoid, from
D．ask, from
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单项选择题
I forgot ______ something which I have long meant to ask you.
A．to ask
B．having asked
C．to be asking
D．to have asked
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