问题
选择题
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
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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
A