He ______ busy yesterday, or he ______ you with your experiment.

A．was; had helped                        B．was, would have helped

C．had been; would have                    D．were; would have helped

 

【答案】

B

【解析】

試題分析：考查時(shí)態(tài)和虛擬語(yǔ)氣；第一空的時(shí)間狀語(yǔ)是yesterday，故使用一般過(guò)去時(shí)。因?yàn)橛泻畹臈l件，用or(否則，要不然)，第二空是一個(gè)與過(guò)去事實(shí)相反的虛擬語(yǔ)氣，使用“情態(tài)動(dòng)詞+have done”的形式；句意：昨天他很忙，要不然，他就會(huì)幫助你做實(shí)驗(yàn)。故B正確。

考點(diǎn)：考查時(shí)態(tài)和虛擬語(yǔ)氣

點(diǎn)評(píng)：條件句中的虛擬語(yǔ)氣；如果過(guò)去事實(shí)相反，條件句中使用過(guò)去完成時(shí)，主句使用“情態(tài)動(dòng)詞+have done”;如果主句與現(xiàn)在事實(shí)相反，條件句中使用過(guò)去時(shí)，be動(dòng)詞使用were,主句中使用“情態(tài)動(dòng)詞+動(dòng)詞原形”；如果與將來(lái)事實(shí)相反，條件句中有三種：過(guò)去時(shí)；were to do ;should+動(dòng)詞原形，主句使用“情態(tài)動(dòng)詞+動(dòng)詞原形”；要特別注意如果省略了if，句子要使用部分倒裝的形式，把助動(dòng)詞，be動(dòng)詞，情態(tài)動(dòng)詞提之主語(yǔ)前。

 

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A. it was made of bamboo  B. it could sound in the sky

C. Li Ye was a musician     D. it looked like a whistle

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A. Wars.                   B. An eagle.

C. Motse's interest in animals.

D. Motse's dream of flying.

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A. Because they were too busy to fly kites.          

B. Because they were not allowed to fly kites.

C. Because it was difficult to make kites.                    

D. Because it was expensive to make kites.

70. Which of the following statements might Dr. Needham agree with?

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B. The Chinese spread the idea of flying to Europe.

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