八、It is necessary/important/urgent that引导的主语从句中，从句的谓语动词要用should+原形动词，should可以省略。
1、It’s desired that she _____ to teach us at least twice a week.
A. comes B. will come C. come D. may come (答案：C)
2、It’s urgent that a meeting _____ before the final decision is made.
A. will be arranged B. must be arranged C. be arranged D. would be arranged(答案：C)
九、It is time (that)…引导的定语从句中，谓语动词用过去时。
1、It’s high time we _____ something to stop traffic accident.
A. do B. will do C. did D. must do (答案：C)
2、Don’t you think it is time you _____ smoking?
A. give up B. gave up C. would give up D. should give up (答案：B)
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