问题
选择题
We cannot figure out ______ quite a number of students were infected with the flu.
A．that
B．when
C．why
D．where
答案
答案：C
考查名词性从句。句中why引导宾语从句，在从句中作原因状语，故选C。
搜题请搜索小程序“爱下问搜题”
We cannot figure out ______ quite a number of students were infected with the flu.
A．that
B．when
C．why
D．where
答案：C
考查名词性从句。句中why引导宾语从句，在从句中作原因状语，故选C。