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提问个英语选择题,_______ maths is the base of all other sciences. A.

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提问个英语选择题,
_______ maths is the base of all other sciences.
A. That is because B. That is that
C. It is that D. Because
我怎么感觉A D都可以啊
because那个题目
如果是回答一个问句:why did u spend so much time on maths?
用D回答不就很合适吗? 这时候用A和D的不同就在于 A更强调了一下(my opinion)
I wish I ________ yesterday’s exam.
A. passed B. had been able to pass
C. were able to pass D. could pass
A.如果用D,后面还应该有句话,否则不完整
D.