1. Whether or not their business will succeed ______ their most concern.
A. have become B. are C. has become D. to become
2. Two-fifths of the people present ______ against the plan.
A. have B. has C. are D. is
3. Two hours ______ to be 5 minutes when one is concentrated.
A. seemed B. to seem C. seem D. seems
4. Einstein has even said, “Politics ______ much more difficult than physics.”
A. has B. have C. is D. are
5. All possible means ______ tried.
A. has been B. have been C. is to be D. wants to be
参考答案：
1. 答案：C 解析：whether … 是一个主语从句，谓语动词须用单数。如：Whether you or he will be appointed has not been decided yet.
2. 答案：C 解析：two-fifths of 后跟可数名词复数，谓语动词须用复数，如：One–third of the computer games were rubbish. 如分数后跟不可数名词，则谓语动词用单数形式，如: Two sevenths of the liquid was used.
3. 答案：D 解析：“两小时”(two hours )在本句中是时间的单数概念，不可数，故须用单数谓语动词。这是个固定事实，故用现在时。另如：Three centuries is considered long for a human.
4. 答案：C 解析：politics (政治)是单数概念，故须用单数谓语动词。另如：Chemistry is not easy to master. /Physics is based on mathematics.
5. 答案：B 解析：means 既是单数概念，也是复数概念，要根据句子意思确定。例如：They said they had a means to make him agree to the budget. /We have many means in increasing production.
本文选自新东方在线论坛。
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