Please wait here.I'll ba back in _______ hours.

问题描述:

Please wait here.I'll ba back in _______ hours.
A two and a half
B two hours and half
C twi hours and halves
D two and half

A
首先排除法,B和C排除,因为后面已经有hours了,BC里再用hours重复.
half在表示“半”的时候,a不能漏掉.