WearepleasedtoknowthatyouhaveplannedtocometotheAutumnGuangzhouFair.Wewishtodiscusswithyousomeotherimportantthingsifyoucouldcome（）yourearliestconvenience.

WearepleasedtoknowthatyouhaveplannedtocometotheAutumnGuangzhouFair.Wewishtodiscusswithyousomeotherimportantthingsifyoucouldcome（）yourearliestconvenience.

A、by

B、on

C、in

D、at

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