Had it been possible I would have gone to the movies, but I ________________ busy


  1. A.
    had been
  2. B.
    am
  3. C.
    was
  4. D.
    would be
C
試題分析：考察時(shí)態(tài)。本題較難，首先考生要清楚前半句是一個(gè)倒裝句，還原成陳述句：If it had been possible I would have gone to the movies.可知本句是對(duì)過去情況的虛擬。But后面要使用陳述語序，故使用一般過去時(shí)。句意：如果可能，我會(huì)去看那部電影的。但是我太忙了。故C正確。
考點(diǎn)：考察時(shí)態(tài)
點(diǎn)評(píng)：英語中的時(shí)態(tài)主要由動(dòng)詞的形式?jīng)Q定，因此在學(xué)習(xí)英語時(shí)態(tài)時(shí)，要注意分析動(dòng)詞形式及具體語境，想象在那個(gè)特定的時(shí)間動(dòng)作所發(fā)生的背景，這個(gè)動(dòng)作是經(jīng)常性動(dòng)作、一般性動(dòng)作、進(jìn)行性動(dòng)作、完成性動(dòng)作還是將要發(fā)生的動(dòng)作。
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       A．hasn’t attracted much attention

       B．well-known to doctors and scientist

       C．was first found by Austrian researchers

       D．is dangerous to animals and human beings

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       A．the virus could also cause other damages

       B．there must be something that is the real cause

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       D．the virus may be caused by the polluted environment

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       A．calculating          B．comparing          C．examining        D．investigating

4．What still remains unknown to American scientists according to the passage?

       A．How and why to kill IAPV．

       B．How IAPV came to America．

       C．Whether bee products should be imported．

       D．How to change the rules of the bee products trade．

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