We can not have that sort of thing happen/happened/to happen/happening选哪个?

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• We can not have that sort of thing happen/happened/to happen/happening选哪个?
• millie didn't want to let the little dog __ ,so she ran after it.A、get awayB、get upC、get onD、get downthe pair of boots is ________ and i don't have so much money to buy them.A、cheap enoughB、enough cheapC、expensive enough D、enough expensiveclass is over .the students are going __ the doormr xia didn't give us the english class today .___?A、ahzt did he happen B、what is he happening C、what happened did he D、what happened to him—— can we go to your office
• We must do our best to prevent that kind of thing( )againA.happening B.to happen C.happen D.happened应该选哪一个呢,为什么我觉得这题表示被发生,可是happen无被动,所以到底是该选A还是选D呢?
• 关于happen的用法1.There are some policeman over there. What is ____ in the stree?A.happening B.happen2.---What happens? ---I can not find my watch. 为什么是happens不是happend?3.有There be happening这个用法吗?如果没有,应该是怎样?4.——We haven’t heard from Jane for a long time. ——What do you suppose____to her? A. was happening B. to happen C. has happened D. having happened 这个选C.为什么不是B?不是有suppose to do吗?
• Once you have cured the water pollution problem,you will have to take steps to avoid it___again,多选题：A.to happen; B.happening; C.happens; D.happened,选A和B不对，如果单选，应选哪个？
• The professor was strict with us andhe wouldn't have that sort of thing__.A.to happen B.happen C.happening D.happened
• We can not have that sort of thing happen/happened/to happen/happening选哪个?
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