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On the way ___a book,he found some of his classmates__in the

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On the way ___a book,he found some of his classmates__in the street.
On the way _______a book,he found some of his classmates_______in thestreet.
A.to buy; knocking down
B.to buy; knocking about
C.to buying; knocking about
D.to buying; knocking into
On the way ___a book,he found some of his classmates__in the
选B.
第一个不定式to buy表示目的状语.
第二个knocking about是伴随状语,表示正在闲逛.
再问: 话说答案选C,不过这么解释,我到明白了,确实该选C