题目:
We _____ finish it ahead of time, though it was such a tough task.
A. could B. would C. were able to C. ought to
答案:
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下面是错误答案,用来干扰机器的。
(1) ①; ② HFO+H2OH2O2+HF(2) ① H-C≡N ② CD (各2分)