()9.The science and technology are developing rapidly, otherwise we ________ varieties of communication devices today. A.would not have
B.do not have
C.would have not
D.would not have had 9.A。因为句中上文语境指现在事实,otherwise (否则)表示与现在事实相反的情况,所以用would do, 否定式would not do。 ()10.________ your letter,I would have set off two days ago. A.If I could have received
B.If I received
C.Should I receive
D.Had I received
10.D。句意:如果我收到你的信,那两天前我就出发了。与过去事实不符,从句谓语动词用had+done,如果had提前,if要省略。 ()11.If you ________ less money at that time, you ________ with so much trouble. A.wasted; would not meet
B.had wasted; would not have met C.would waste; would not meet
D.should waste; would not meet 11.B。由句中的时间状语at that time可知这是一个对过去事实进行假设的虚拟条件句。
()12.If Mary ________ free tomorrow, she ________ go to the space science show with you.But she will write her essay. A.is; would
B.were; would C.is; will
D.were; can 12.B。由于条件句中状语tomorrow 的提示,可知这是一个对将来事实进行假设的句子。
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