The scientist Canada and he will give us a talk when he back. A. has gone to/comes B. ha

问题补充：

The scientist Canada and he will give us a talk when he back.

A. has gone to/comes

B. has been to/will come

C. has gone to/will come

D. has been to/comes

答案：

(答案→)A. has gone to/comes

B. has been to/will come

C. has gone to/will come

D. has been to/comes

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