问题：
(2013·福建，29)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
(2013·福建，29)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 |
参考答案：