Sales of CDs have greatly increased since the early 1990s, when people _______ to enjoy? the advantages of this new technology.
A．beginB．began?
C．have begunD．had begun?
B?
此題考查since以及定語(yǔ)從句的時(shí)態(tài)照應(yīng)。since加過(guò)去時(shí)間點(diǎn)，主句自然用完成時(shí)態(tài)。既然since跟的是過(guò)去的時(shí)間點(diǎn)，那么when指代的當(dāng)然就是過(guò)去時(shí)間in the early 1990s，所以選過(guò)去式began。
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