单项选择3.isthisthebird_________?a.f
3.is this the bird _________? a.for that you are looking b.that you are looking for c.for that you are looking for d.that you are looking
b 定语从句中，介词不能和关系代词that前后连用，所以排除a.c 不选d在于　它忽视了　look for 的　固定搭配问题了．