题干
-Clark, your room is really in a mess, It needs ____
-Sorry , mum . I’ll do it at once
A：clean
B：cleaned
C：to clean
D：to be cleaned
答案(点此获取答案解析）
D
-Clark, your room is really in a mess, It needs ____
-Sorry , mum . I’ll do it at once
A：clean
B：cleaned
C：to clean
D：to be cleaned
于点A，PD⊥y轴于点D，交