单项选择题

The ground is wet. It ______have rained last night.

A．
[A] must

B．
[B] can

C．
[C] should

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单项选择题
I want to buy a notebook. Could you show me ______
A．
[A] one

B．
[B] it

C．
[C] another
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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