13.A driver should ________ the road when _________.( 。
A.concentrate on; driveB.concentrate in; driving
C.concentrate to; droveD.concentrate on; driving

分析 開車時駕駛員的注意力要集中在路面上.

解答 答案是D.本題考查介詞搭配和"連詞+分詞"的結(jié)構(gòu).題干中考查動詞短語concentrate on表示"注意力集中于…",所以排除B和C;第二空考查"連詞+分詞";"連詞+分詞"的結(jié)構(gòu)在句中往往做狀語,屬于分詞做狀語;分詞做狀語時分詞的選擇是看分詞和句子主語之間的關(guān)系:分詞和句子主語之間是主謂關(guān)系(主動關(guān)系),用現(xiàn)在分詞;分詞和句子主語之間是動賓關(guān)系(被動關(guān)系),用過去分詞;本題中連詞when后的drive 和句子主語a driver之間是主動關(guān)系,所以答案選擇D.

點評 首先判斷選項中的動詞在句中是以謂語還是非謂語形式出現(xiàn),然后根據(jù)選項在句中的功能結(jié)合非謂語的基本用法做出合理的判斷.

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