语法综合练习7Sales 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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![语法综合练习7Sales 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.](/uploads/image/z/12590180-44-0.jpg?t=%E8%AF%AD%E6%B3%95%E7%BB%BC%E5%90%88%E7%BB%83%E4%B9%A07Sales+of+CD%27s+have+greatly+increased+since+the+early+1990s%2Cwhen+people+______+to+enjoy+the+advantage+of+this+new+technology.A.begin+B.began+C.have+begun+D.had+begun%E8%AF%B7%E8%AF%A6%E7%BB%86%E5%86%99%E5%87%BA%E8%A7%A3%E9%A2%98%E7%9A%84%E8%BF%87%E7%A8%8B%E5%92%8C%E6%80%9D%E8%B7%AF.)
语法综合练习7Sales 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.
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.
语法综合练习7Sales 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.
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.