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

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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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