B.which
C.Whether
D.that 解析:本题考查主语从句,it为形式主语,that引导的从句为真正的主语。 答案:D 2.The human race would soon die out if we could only see beauty within a set of limited criteria. 如果我们只能够用一套有限的标准来衡量美,人类不久将灭绝。 【精讲拓展】 本句用了虚拟语气,表示与将来事实相反。主句用would/should/could do,从句用一般过去时,should do,were to do。 If Professor Li should have time tomorrow,we could ask him some questions. 如果李教授明天有时间的话,我们可以问他一些问题。 【归纳拓展】 (1)虚拟语气现在时。用以表示与现在事实相反的假设或现在实现可能性不大的情况。 条件从句:动词过去式(be多用were) 主句:would/should/could/might+动词原形 If I were a bird,I would fly to you. (2)虚拟语气过去时。表示与过去事实完全相反的假设。 条件从句:had+过去分词 主句:would/should/could/might+have+过去分词 If she hadn’t been ill,she might have come. (3)虚拟语气将来时。用以表示与将来事实相反的假设条件从句:动词过去式,were to+动词原形,should+动词原形 主句:would/should/could/might+动词原形 If it were to rain tomorrow,the match would be put off.如果明天下雨,比赛将推迟。 ◆书面语中,上述三种时态的虚拟句中,如果从句里含有should,had,were,则可将从属连词if省去,将should,had,were放在句首形成部分倒装。 Were he in your position,he’d do the same. Had I had time,I would have done that yesterday. Should he come tomorrow,I should give him the dictionary. 即学即用 You didn’t let me drive.If we ________ in turn,you ________ so tired. A.drove;didn’t get
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