17．---Why were you so late for work today？
---        to the office was very slow this morning because of the traffic．（　�。�
A．DrivingB．I droveC．To driveD．That I drove

分析 -為什么你今天遲到了？
-因為交通高峰期，所以駕車去辦公室是很慢的．

解答 答案：A．
本題中的動名詞driving to the office做為句子的主語，動名詞做主語指經(jīng)常性，習(xí)慣性的行為．B項不能做主語；C項不定式做主語是指一次性的行為；D項是主語從句做主語，但是意思不匹配．故選A．

點(diǎn)評 動名詞做主語表示經(jīng)常性，習(xí)慣性的動作．如果是單個的動名詞做主語，謂語動詞用單數(shù)形式．

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