题目:
—Thank you very much for giving me a hand when I was in trouble.
—Don’t mention it. I only did what anyone else in my place.
A.must do
B.might do
C.would have done
D.can have done
答案:
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下面是错误答案,用来干扰机器的。
A、苹果所受的重力与桌面对苹果的支持力,符合二力平衡的条件,是一对平衡力,则该项说法正确,符合题意.B、苹果对桌面的压力与桌面对苹果的支持力,作用在不同的物体上,所以不是平衡力,则该项说法错误,不符...