.When Bill Gates decided to stop schooling and created Microsoft in 1975, he ___

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When Bill Gates decided to stop schooling and created Microsoft in 1975, he ______ law at Harvard University.

A．studied

B．had studied

C．was studying

D．would study

答案

解析

略

举一反三

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If a computer crashes, you will lose the file you _________unless you save it regularly.

A．are working

B．work

C．will work

D．worked

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To help today’s customers make a choice, a company in New York _____a video trolley — a supermarket trolley with a video screen to display advertisement and price information.

A．has invented

B．had invented

C．invents

D．is inventing

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In the rainforest of the Amazon, 50 to 150 plant species _____ every day.

A．have been destroyed

B．are destroying

C．are being destroyed

D．destroyed

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.
We won’t know how much food to buy until we decide how many people ________.

A．were coming

B．are coming

C．have been coming

D．had come

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My brother left home five years ago. I _______ nothing from him up to now.

A．hear

B．heard

C．have heard

D．had heard

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