.If a computer crashes, you will lose the file you _________unless you save it r - 高中英语试题 - 超级试练试题库

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题型：不详难度：来源：

.
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

答案

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试题【.If a computer crashes, you will lose the file you _________unless you save it r】；主要考察你对一般现在时等知识点的理解。[详细]

举一反三

.
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

题型：不详难度：| 查看答案

.
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

题型：不详难度：| 查看答案

.
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

题型：不详难度：| 查看答案

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

A．hear

B．heard

C．have heard

D．had heard

题型：不详难度：| 查看答案

.
The day — my birthday — I had been looking forward to _______ at last.

A．come

B．coming

C．has come

D．came

题型：不详难度：| 查看答案

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