The English play _ many students are preparing at the New Year's party will be a great success.A.for which B.at which C.in which D.on which

The English play _ many students are preparing at the New Year's party will be a great success.
A. for which B. at which C. in which D. on which
选项是A.
are preparing for 是一个规固定词组，意思是：“为。。。做准备”
for which many students are preparing at the New Year's party 是一个定语从句
修饰先行词play.
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选A，for which。
这道题考查的是定语从句的关系词和固定搭配
先行词The English play 在句中作宾语
prepar与for连用，意为“准备”

复合句，拆开看 the english play will be a great success.主句
这个剧情将会成功。选第三个，必须的，in which equal to where ,do you understand

A prepare for 固定搭配“为……做准备” 定语从句习惯把介词放在which前面。
由众多同学准备的英语剧，将会在新年晚会上取得巨大成功。

选择A,prepare for