The English subject,__I have mastered well,is important in middle school.A./ B.at which C.that D.in which

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The English subject,__I have mastered well,is important in middle school.A./ B.at which C.that D.in which
The English subject,__I have mastered well,is important in middle school.
A./ B.at which C.that D.in which

The English subject,__I have mastered well,is important in middle school.A./ B.at which C.that D.in which
A./ 为正确选项.
master是及物动词,直接带宾语,B和D排除;非限制性定语从句不能用that引导,排除C;关系代词在定语从句里做宾语,可以省略,这与限制性定语从句一样.至此,正确选项浮出水面.

【俊狼猎英】团队为您解答.

亲,master这个用法我没有学过;但是这是一个非限定性定语从句;
所以绝对不能选C that;
如果master后面是直接+The English subject的话,那么就只能选择A;