today ,we'll discuss a mumber of cases ___beginn

问题描述:

today ,we'll discuss a mumber of cases ___beginn
today ,we'll discuss a mumber of cases ___beginners of english fail to use the language propeely
A which B as C why D where

D这是cases虚拟地点状语.定语从句.不懂啊cases译为情况,在这里是先行词,而它是一个虚拟地点状语,后面没介词,所以用D.还不懂哎……-_-||