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 |
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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 |
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