几道英语选择题It wasn't such a good birthday party -------- she had

几道英语选择题It wasn't such a good birthday party ________ she had promised usIt wasn't such a good birthday party ________ she had promised us.A.that B.that C.as D.but选C的理由是什么?A为什么不能选,不是有一个句型lt is .that么?2.Nowadays,a graduate with a master's degree______fail to find a high-paid job,which discourages a lot of college students.A.shall B.can C.will D.must选B理由?A,C为什么不能选?3.Hearing Harry eventually won the first place in the English Writing Competition,l cannot but____his talent and hard work.A.admire B,admiring C.admired D.toadmire4.Mr.smith,what do you suggest can ensure my son's health?----____more exercise,l thinkA.to take B.Take C.by taking D.Taking选得是D,为什么不选A和B?它们分别用在哪些方面?