Question

【题目】After ________ you that letter I realized how stupid I was.

A. sent B. sending C. send D. to send

Answer 1

【答案】B

【解析】句意：寄给你那封信后，我意识到自己是多么的愚蠢。after为介词，后接动名词。A. sent过去式；B. sending动名词；C. send原形；D. to send动词不定式。故选B。