my sister has a lot of trouble -----maths A to learn B.learing C learned D learns

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mysisterhasalotoftrouble-----mathsAtolearnB.learingClearnedDlearnsmysisterhasalotoftrouble-----maths

my sister has a lot of trouble -----maths A to learn B.learing C learned D learns
my sister has a lot of trouble -----maths A to learn B.learing C learned D learns

my sister has a lot of trouble -----maths A to learn B.learing C learned D learns
B,have trouble (in) doing sth

B