To receive online billing service, clients should______a request by e-mail including their name, e-mail address, and account num

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问题 To receive online billing service, clients should______a request by e-mail including their name, e-mail address, and account number.

选项 A、submits
B、submitted
C、submit
D、submitting

答案C

解析情态动词should后面应接动词原形，因此(C)submit(提交)为正确答案。动词的第三人称单数形式(A)，动词的过去式或过去分词(B)，动名词或现在分词(D)都不能接在情态动词后面。

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