With his attention________on the shops along the roadside,he knocked an old man down while riding to school.
A concentrating B.concentrated C.to concentrate D.concentrates
答案 B
解析 考查词组,故选B项。
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With his attention________on the shops along the roadside,he knocked an old man down while riding to school.
A concentrating B.concentrated C.to concentrate D.concentrates
答案 B
解析 考查词组,故选B项。