.He said he experiments those days.A. was doingB. had been doingC. has been doingD. is do

问题补充：

.He said he experiments those days.

A. was doing

B. had been doing

C. has been doing

D. is doing

答案：

A. was doing

(答案→)B. had been doing

C. has been doing

D. is doing

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