【題目】SalesofCDshavegreatlyincreasedsincetheearly1990s,whenpeople_____toenjoytheadvantagesofthisnewtechnology.

A. begin B. began

C. havebegun D. hadbegun

【答案】B

【解析】考查一般過去時態(tài)。句意:自上世紀90年代初,人們開始享受這種新技術(shù)的優(yōu)勢后,CD的銷售量大大增加了。在英語中,since(自從……)從句用一般過去時,主句用現(xiàn)在完成時。分析句子可知,本句中的主句用現(xiàn)在完成時,從句就要用一般過去時,故選B項。

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