. Sales of CDs have greatly increased since the early 1990s, when people _______
题型：不详难度：来源：
. Sales of CDs have greatly increased since the early 1990s, when people ________ to enjoy the advantages of this new technology. | A．begin | B．began | C．have begun | D．had begun |
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答案
| B |
解析
| when引导的是一个非限制性定语从句，when指20世纪90年代初，当然用一般过去时。 |
举一反三
—Can I drive on the free way, Mr. Green?
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Once a programme ________ put into a computer, it ________ accordingly. | A．is; acts | B．is being; is acting | C．has been; will act | D．will be; acts |
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How can I ever concentrate if you ________ continually ________ me with silly questions? | A．have…interrupted | B．had interrupted | C．are…interrupting | D．were…interrupting |
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