问题
单项选择题
The little boy was continually ________the ornaments.
A.tripping up
B.falling down
C.breaking up
D.knocking over
答案
参考答案:D
解析:习语辨析。trip up绊倒;fall down倒下,跪拜;break up打碎,分裂,结束;knock over打翻,弄倒;因此选项D为答案。