单项选择题

Do you know ______this word

A．
[A] what to spell

B．
[B] how to spell

C．
[C] to spell

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单项选择题
I'll go ______tomorrow.
A．
[A] to swim

B．
[B] swim

C．
[C] swimming
单项选择题
They have visited many places ______last month.
A．
[A] since

B．
[B] when

C．
[C] until
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