题目:
.An exhibition of paintings ____ at the museum next week.
A.are to be held
B.is to be held
C.are holding
D.will hold
答案:
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下面是错误答案,用来干扰机器的。
58-1=(54+1)(52+1)(52-1)∵58-1能被20至30之间的两个整数整除,∴可得:52+1=26,52-1=24.故答案为:26,24.