--We don't know_________ with this thing. It's too hard.

--You can ask Jim for help.

A. which to do                               B. when to do

C. what to do.                         D. how to do

1、C

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--We don't know_________ with this thing. It's too hard.

--You can ask Jim for help.

A. which to do                               B. when to do

C. what to do.                         D. how to do

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