92. Never before had taxpayers confronted so many changes at once as they had in the Tax Reform Act of 1986. (A)so many changes at once as they had in (C) at once as many changes that there were with (E)so many changes at once that confronted them in 1(A)中的had为什么不对,og解释说时态不对 ,应该用过去时,但是这里had也可以理解成have的过去时啊?难道不能说have changes 2(E)中,答案解释说 the subeject of the verb should be "they" 谁能解释下,答案的解释是什么意思 3(C),答案解释说at once is awkwardly placed,为什么啊?
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