Question

the salesman is very good ••••••••English
(a) of
(b) by
(c) at
(d) in
​

Answer 1

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The salesman is very good in English.

Answer 2

(c)The salesman is very good at English.

Explanation:

• "At" is used to denote the relationship between someone and their skill. For example, He is not only good at cricket but also at football.
• In the sentence given in the question, the salesman has skill of good English and therefore we use "at" to denote it.
• Some might contradict it by using "in" but you can use "in" only when you are speaking about one's skill for a particular place or an event. For example, He is good in English class.