题目:
The children went home from the grammar school, their lessons____ for the day. [ ]
A. finishing
B. finished
C. had finished
D. went finished
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:如果两种商品共同满足人们的一种需要,这两种商品就是互补商品。如果两种商品的功用相同或相近,可以满足消费者的同一需要,这两种商品就互为替代品。所以①②④是互补商品。③是互为替代品。故...