[单选题]题目11未回答满分1.00未标记标记题目. Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.
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2024-02-03 16:06:25
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[单选题]题目11未回答满分1.00未标记标记题目. Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.

a. to be doing
b. to do
c. to have done
d. to have been doing
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