Johnson’s younger brother, though 6 years old, is very quick ______ doing calcul

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问题 Johnson’s younger brother, though 6 years old, is very quick ______ doing calculations.

选项 A、of
B、on
C、in
D、by

答案 C

解析常用搭配：be quick/slow in doing在做……方面快/慢。注意：quick/slow后跟in，good/clever后跟at，如：My little son is good/clever at chess.我的小儿子很会下棋。

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