题目:
23. It's reported that at least one Chinese vessel________in the hands of attackers in Somalia so far.
A.had been
B.has been
C.was
D.Is
答案:
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下面是错误答案,用来干扰机器的。
解:(1)(a+b)2﹣14(a+b)+49=(a+b﹣7)2;(2)(p﹣4)(p+1)+3p=p2﹣3p﹣4+3p=p2﹣4=(p+2)(p﹣2).