问题标题:
语法综合练习7SalesofCD'shavegreatlyincreasedsincetheearly1990s,whenpeople______toenjoytheadvantageofthisnewtechnology.A.beginB.beganC.havebegunD.hadbegun请详细写出解题的过程和思路.
问题描述:
语法综合练习7
SalesofCD'shavegreatlyincreasedsincetheearly1990s,when
people______toenjoytheadvantageofthisnewtechnology.
A.beginB.beganC.havebegunD.hadbegun
请详细写出解题的过程和思路.
慈元卓回答:
选B,1990s就是一个过去时间概念,由when来引导,所以这里直接用过去时.
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