Mrs. Smart insisted that she _____ the work all by herself, but nobody believed her.

A. had done
B. should do
C. did
D. do
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科目:高中英語 來源:0115 期末題 題型:單選題

Mrs. Smart insisted that she _____ the work all by herself, but nobody believed her.
[     ]
A. had done
B. should do
C. did
D. do

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