We cannot figure out ______ quite a number of students were infected with the fl

题干

We cannot figure out ______ quite a number of students were infected with the flu.

A．that

B．when

C．why

D．where

上一题下一题 0.85难度单项选择更新时间:2010-11-16 10:53:30

小学学科试题库

初中学科试题库

高中学科试题库