He mentioned in the letter that he join us once he our invitation. A. would come; receiv

问题补充：

He mentioned in the letter that he join us once he our invitation.

A. would come; received

B. had come; received

C. was coming; had received

D. came; received

答案：

A. would come; received

B. had come; received

C. was coming; had received

D. came; received

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