My sister has a lot of trouble ( )maths A.to learn B.learning C.learned D.learns

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My sister has a lot of trouble ( )maths A.to learn B.learning C.learned D.learns
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My sister has a lot of trouble ( )maths A.to learn B.learning C.learned D.learns
My sister has a lot of trouble ( )maths A.to learn B.learning C.learned D.learns

My sister has a lot of trouble ( )maths A.to learn B.learning C.learned D.learns
B
have trouble doing sth 做.有麻烦
希望我的回答能够帮到你,

选B trouble 后面用动词ING形式