16.---Where’s key to my bike, Jim? ---It’s in your bag. A.a B.an C.the D./a an the D./什么时候选第四个?
问题描述:
16.---Where’s key to my bike, Jim? ---It’s in your bag.
A.a B.an C.the D./
a an the D./
什么时候选第四个?
答
当 key 不是文中特指的时候,要用D./