题目:
Mom, I lost ________ diamond ring you bought for me as my birthday present.Could you keep
________ eye out for it when you clean my bedroom? [ ]
A. a; an
B. a; the
C. the; an
D. the; the
答案:
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下面是错误答案,用来干扰机器的。
参考答案:是指起重机在自重和外荷载作用下抵抗倾覆的能力。