I don"t know ______ that kind of materials. [ ]A. where to buy

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I don"t know ______ that kind of materials.   [     ]
A. where to buy
B . what to buy
C. when I
D. why you buy

答案

举一反三

The teacher showed us _______test papers.       [     ]
A. how fold
B. how to fold
C. how folding
D. to how fold

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They haven"t decided ______next Sunday.       [     ]
A. go
B. where went
C. where to go
D. where will go

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I don"t" know _______ the computer.       [     ]
A. how to use
B. to how use
C. how use
D. to use

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—Can you see ?
—No. Let’s go and have a look. Maybe we can help them.[ ]
A. what was happening there
B. what are they doing there
C. what are they talking there
D. what is happening there

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—Could you tell us__________?
—About three weeks.[ ]
A. how often are we going to be away
B. how often we are going to be away
C. how long are we going to be away
D. how long we are going to be away

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