--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
科目：初中英語 來源： 題型：
--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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