20．Give my regards to your parents when you _____ home．（　�。�
A．will callB．callC．have calledD．called

分析 當(dāng)你打電話回家時(shí)，代我問候你的父母．

解答 答案：B
句意：當(dāng)你往家打電話的時(shí)候替我給你的父母問好．從句意可知此處表示將來，在時(shí)間狀語從句中用一般現(xiàn)在時(shí)表示將來，選B．

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．時(shí)間條件狀語從句的時(shí)態(tài)也是考查的重點(diǎn)．

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