How many students are born( )the star sign of Aquarius in yo

題目：

How many students are born( )the star sign of Aquarius in your classAwith B to C under D for 有誰知
講講思路，今天才考試的

解答：

C
再問： 爲什麼啊？
再答： 固定搭配。說出生在某某星座。用under