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【题目】SalesofCDshavegreatlyincreasedsincetheearly1990s,whenpeople_____toenjoytheadvantagesofthisnewtechnology.

A. begin B. began

C. havebegun D. hadbegun

【答案】B

【解析】考查一般过去时态。句意:自上世纪90年代初,人们开始享受这种新技术的优势后,CD的销售量大大增加了。在英语中,since(自从……)从句用一般过去时,主句用现在完成时。分析句子可知,本句中的主句用现在完成时,从句就要用一般过去时,故选B项。

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