句型转换,每空一词.

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句型转换,每空一词.
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句型转换,每空一词.
句型转换,每空一词.
 

句型转换,每空一词.
1 hadn't sung
2 Had ,taken off
3 had learned
4 began ,had bought
要注意时态(主句是一般过时从句要用相应的过去时)