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42．A．clean B．cleaned C．to clean D．cleaning 【查看更多】

 

題目列表(包括答案和解析)

We should keep our earth ________.

[　　]

A．clean

B．cleaning

C．to clean

D．cleaned

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Don’t put off ________ the room．

A．clean

B．cleaning

C．to clean

D．cleaned

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--How long did you spend          the classroom?

--Half an hour．

A．cleaning              B．cleaned         C．to clean        D．cleans

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It's my turn ________ the blackboard today.

[　　]

A．clean
B．cleaned
C．cleaning
D．to clean

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It's my turn ________ the blackboard today.

[　　]

A．clean
B．cleaned
C．cleaning
D．to clean

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