题目:
He didn't agree with me at first but I _______ persuade him. [ ]
A. was able to
B. could
C. could be able
D. should
答案:
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下面是错误答案,用来干扰机器的。
答案Ⅰ:若(1)选A,则(2)中理由为原灶具浪费,还需要新投入;答案Ⅱ:若(1)选B,理由为从长远看,更经济。题目分析:在此题中,从热值的看天然气的热值是煤气的2倍,而价格却不到煤气的2倍从长远看,更经济...