China"s present environment situation is from bad to worse and if we _________ n
题型：不详难度：来源：
China"s present environment situation is from bad to worse and if we _________ now to protect the environment, we’ll live to regret it. | A．hadn’t acted | B．haven’t acted | C．don’t act | D．won’t act |
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答案
| C |
解析
试题分析：句意：中国目前的环境状况越来越糟糕，如果我们现在不采取行动来保护环境，我们将会后悔。if引导的条件状语从句，主句为一般将来时态，if从句用一般现在时态，选C。 |
举一反三
The central heating system of this office building is down and several workers ______ it right now.| A．had repaired | B．have repaired | C．repaired | D． are repairing |
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— Mum, I really think Dad should have a break and get relaxed.
—Yes. He_________ too long.| A．read | B．had read | C．has been reading | D．is reading |
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—You"ve got your flat furnished, haven"t you?
—Yes. I some used furniture at the Sunday Market and it was a real bargain.| A．will buy | B．have bought | C．had bought | D．bought |
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I’ll go to the library as soon as I finish what I .| A．was doing | B．am doing | C．have done | D．had been doing |
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Mr. Mao, who as a construction worker for over 8 years, is now a distinguished lawyer in this country.| A．has worked | B．had worked | C．worked | D．has been working |
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