Mrs Smith finds it hard to clear up the mess, as her children are always whenever she tries to.
A. in the way
B. on watch
C. in sight
D. on the line
网友回答
(答案→)A. in the way
B. on watch
C. in sight
D. on the line
解析：考查介词短语：A妨碍，B值班，监视，C在视野之内D冒极大的危险，根据句意：斯密斯太太发现很难打扫家里的混乱，因为每当她想这么做孩子们就会很碍事。所以选A。