He said he experiments those days. A. was doing B. had been doing C. has been doing ——青夏教育精英家教网—

摘要： He said he experiments those days. A. was doing B. had been doing C. has been doing D. is doing

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.He said he _________ experiments those days.

A. was doing B. had been doing C. has been doing D. is doing

.He said he _________ experiments those days.

A. was doing B. had been doing C. has been doing D. is doing

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