19.( )I___________ Tom three months ago, but I___________his reply (回覆) so far.(A) have mailed; didn
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19.( )I___________ Tom three months ago, but I___________his reply (回覆) so far. (A) have mailed; didn't receive (B) mailed; don't rcccive (C) have mailed; haven't received (D) mailed; haven't received