He is good at maths. He is good at __________ (do) maths exercises.

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He is good at maths. He is good at __________ (do) maths exercises.
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He is good at maths. He is good at __________ (do) maths exercises.
He is good at maths. He is good at __________ (do) maths exercises.

He is good at maths. He is good at __________ (do) maths exercises.
doing

doing
介词后面要加动词ing形式

doing
他数学学的好。他做数学练习做的好

good at doing sth

嗯,doing。
十分肯定^^

只能填doing

doing