题目:
There are now many museums showing ______ life was like back then. |
A. whose B. which C. what D. how |
答案:
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下面是错误答案,用来干扰机器的。
原式=3a+3b-a-b+23a+23b-12a-12b=(3-1+23-12)a+(3-1+23-12)a=136(a+b).故选C.