Question

102. Choose the correct preposition. He is not very good…. doing sums. A) on B) in C) with D) at E) upon

Answer 1

He is not very good…. doing sums. A) on B) in C) with D) at E) upon

 

Устойчивое выражение to be good at - быть способным, преуспевать

Answer 2

He is not good at doing sums.