问题
选择题
He was thinking about the problem when an apple fell off the tree, _______ him right on the head.
A．hit
B．having hit
C．hitting
D．and hitting
答案
答案：C
现在分词做状语“苹果”与“撞击”为主谓关系。他正在想问题这时一个苹果落下来正好打中他的头部。选C
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