I am_____English ,so I must work harder than before.A.poor in B.poor at C.good at D.well in请具体说明

I am_____English ,so I must work harder than before.
A.poor in B.poor at C.good at D.well in
请具体说明

B

b

A

选A

He goes to work after taking a cold shower in the morning.

be good at 擅长......
do well in 在.....方面做得好
be poor in 在哪方面做的不好,不擅长...所以选A....