摘要： troubles me is I don’t know is to be done with the new machine. A. What; what; that B. What; that; how C. What; that; what D. What; because; which
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_____ troubles me is _____ I don't know _____ is to be done with the new machine.
[ ]
A. What; what; that
B. What; that; how
C. What; that; what
D. What; because; which
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B. What; that; how
C. What; that; what
D. What; because; which