The following sentence contains either a single error or no error at all. If the sentence contains an error, select the one underlined part that must be changed to make the sentence correct.If the sentence contains no error, select choice E.

　　Once the suspension bridge replaced the cantilever, the United States becomes the world leader in this new type of long-span bridgebuilding. No error

　　(A) Once

　　(B) becomes

　　(C) in this new

　　(D) type of

　　(E) No error

　　Explanation

　　The error in this sentence occurs at (B), where there is an inappropriate verb form. To match the past tense established and used elsewhere in the sentence ("Once," "replaced"), the past-tense "became" is needed.

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　　（编辑：马菲）