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语法综合练习7SalesofCD'shavegreatlyincreasedsincetheearly1990s,whenpeopletoenjoytheadvantageofthisnewtechnology.A.beginB.beganC.havebegunD.hadbegun请详细写出解题的过程和思路.
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语法综合练习7
Sales of CD's have greatly increased since the early 1990s, when
people ______ to enjoy the advantage of this new technology.
A. begin B. began C. have begun D.had begun
请详细写出解题的过程和思路.
Sales of CD's have greatly increased since the early 1990s, when
people ______ to enjoy the advantage of this new technology.
A. begin B. began C. have begun D.had begun
请详细写出解题的过程和思路.
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答案和解析
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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