摘要： 选 D. 考查情态动词.shall用于第三人称意为“要不要.
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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。
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一、情态动词类
.Facts prove that the world’s economic development is not a win—lose game but one in which all _____be winners.
can B.shall C.must D.would
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