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  3. The reason________the injection needs repeating every year is that the virus constantly changes.

The reason________the injection needs repeating every year is that the virus constantly changes.

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问题 The reason________the injection needs repeating every year is that the virus constantly changes.
选项 A、which
B、what
C、why
D、when
答案C
解析 分析句子结构可知，空处引导一个定语从句，修饰表示原因的先行词The reason，所以应用关系副词why引导从句，也可用that代替why，that可以省略，相当于for which，在从句中作原因状语。which在定语从句中作主语、宾语或表语；what不能引导定语从句；when在定语从句中作时间状语，这三项均不符合题意。故选C。
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