We cannot figure out quite a number of students were infected with the flu.A．that B．whenC．whyD．where 题目和参考答案——青夏教育精英家教网——

题目内容

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

A．that

B．when

C．why

D．where

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。

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