7.Mary _____ a photo of Professor Smith while he was making a speech.( 。
A.takesB.tookC.would takeD.has taken

分析 當(dāng)史密斯教授在做演講時,瑪麗給他拍了張照片.

解答 答案:B
句中的while"在…時候","一邊…一邊…";它強調(diào)主句的動作與從句的動作同時發(fā)生或主句的動作發(fā)生在從句的動作過程中;所以根據(jù)while 從句使用了過去進(jìn)行時( was making a speech)可知,主句的動作"_____ a photo of Professor Smith 給史密斯教授拍照"應(yīng)該發(fā)生在"他(過去)在做演講"的過程中或者也可以說兩個動作在同時發(fā)生,所以此處要使用一般過去時;A.takes 是一般現(xiàn)在時態(tài);B.took是take的一般過去是形式;C.would take是過去將來時;D.has taken 是現(xiàn)在完成時;故選B.

點評 本題考查了一般過去時在while從句中的用法,但是while從句中的謂語必須是表示動作或狀態(tài)的延續(xù)性動詞,它強調(diào)主句的動作與從句的動作同時發(fā)生或主句的動作發(fā)生在從句的動作過程中;因此當(dāng)while從句使用過去進(jìn)行時,主句應(yīng)使用一般過去時;本句動詞take的過去時形式是took,因此還需要熟練掌握動詞不規(guī)則變化表.

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