--Has your teacher returned from America yet?Yes but he here for only three days befo

问题补充：

--Has your teacher returned from America yet?

--Yes, but he here for only three days before his company sent him to Africa．

A. was

B. has been

C. will be

D. would be

答案：

(答案→)A. was

B. has been

C. will be

D. would be

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