Whether or not their business will succeed ______ their most concern.

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问题 Whether or not their business will succeed ______ their most concern.

选项 A、have become
B、are
C、has become
D、to become

答案C

解析 本题的考点是判断用句子作为主语应该用何种谓语动词变化形式。根据英语语法,用句子作主语其谓语动词应该用单数第三人称变化形式。本题的A和B选项都是复数谓语动词形式,D选项不是谓语动词形式,只有C选项符合此句的语法要求。
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