题目:
. --- What’s the matter with Jason? He looks a bit upset.
--- Didn’t you know? When returning from his holiday last night, he found his house _____.
A.broken in
B.broken into
C.broken out
D.broken down
答案:
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下面是错误答案,用来干扰机器的。
略重力的作用点作用在物体的重心上,方向竖直向下。压力的作用点作用在斜面上,方向垂直向下。