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题目
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Scientific experiments __________ by students without the teachers’ instructions can be dangerous.
A.carry outB.carrying outC.carried outD.carrying

答案
C
解析
考查非谓语动词experiments与carry out为动宾关系要用过去分词作定语。句意:学生没有老师指导做科学实验有可能有危险。
核心考点
试题【Scientific experiments __________ by students without the teachers’ instructions】;主要考察你对一般现在时等知识点的理解。[详细]
举一反三

It ______ be better if I could earn enough money to buy a private car.
A.willB.mustC.shallD.would

题型:不详难度:| 查看答案

In many factories computers have ___________ the work of thousands of workers.
A.taken placeB.taking placeC.taken place ofD.taken the place of

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You’d better not call me up between 7 and 8 this evening, for I ____ an important meeting then.
A.will haveB.am havingC.will be havingD.will have had

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—Alice, you look puzzled.Haven’t you understood it?
—Yes.I       _of another problem just now.
A.had thoughtB.have thoughtC.thoughtD.was thinking

题型:不详难度:| 查看答案
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A.will comeB.come C.cameD.are coming

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