【題目】I've earned my own living __________ I was seven.

A. in B. since C. for D. /

【答案】B

【解析】句意:自從我七歲開始我就自己謀生了。in里面,泛指在上午、下午或晚上,加年代、月份、季節(jié)等;since自從;for為了,后面跟一段時(shí)間。這個(gè)空應(yīng)填連詞since,引導(dǎo)的是時(shí)間狀語(yǔ)從句,從句中用一般過去時(shí)態(tài),主句用現(xiàn)在完成時(shí)態(tài)。故應(yīng)選B。

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