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
解析:可联系答.案.网客服索取。