9．With the rise of modern communication tools，handwritten letters ______ by emails．（　�。�
A．will replaceB．have replaced
C．are    replacedD．are being replaced

分析 隨著現(xiàn)代通訊工具的增加，手寫信正被電子郵件代替．

解答 答案：D
根據(jù)句意分析handwritten letters和replace是被動關(guān)系，而且這個動作是現(xiàn)在正在發(fā)生．用現(xiàn)在進行時的被動式，結(jié)構(gòu)為be being done．選D．

點評 英語中的時態(tài)主要由動詞的形式?jīng)Q定，因此在學習英語時態(tài)時，要注意分析動詞形式及具體語境，想象在那個特定的時間動作所發(fā)生的背景，這個動作是經(jīng)常性動作、一般性動作、進行性動作、完成性動作還是將要發(fā)生的動作．考查時態(tài)的時候別忘了語態(tài)問題．

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