The great contributors in life are those who, afraid of the knock at the door, still answer it.A. if

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【题目】The great contributors in life are those who, ______ afraid of the knock at the door, still answer it.

A. if B. since C. though D. unless

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【答案】C

【解析】

考查状语从句。A. if如果；B. since既然；C. though尽管；D. unless除非。句意：生活中最大的贡献者是那些虽然害怕有人敲门，但仍然去开门的人。故选C。