Mike didn't start＿＿＿＿the importance of a foreign language till he graduated from school.

　　A.knowing   B.to know   C.know   D.to have known

B

start后可以接-ing形式或to do,但如果start后面的動(dòng)詞表示心理活動(dòng)的詞時(shí),必須用不定式。

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