题目内容
-
How long ________ it ________ you to work out such a difficult problem?-
About thirty minutes.[ ]
A.
did…take
B.
does…take
C.
did…cost
答案:A
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题目内容
-
How long ________ it ________ you to work out such a difficult problem?-
About thirty minutes.did…take
does…take
did…cost