Fill in the blank with the most appropriate word.
I always enjoyed ____ in that lake in summer.
The context refers to always enjoying activity in the lake. The main
verb in the sentence determines whether you use a gerund or an infinitive. ‘Enjoy’ requires a gerund. “Swimming”
in option D is correct as it takes the gerund form of the verb “swim” by taking
verb + ing.
“To have swum” in option A is incorrect as it has taken the infinitive form in
the past tense. This does not agree with the context of the sentence.
“Been swimming” in option B is grammatically incorrect in the context.
“To swimming” in option C is the infinitive form of the verb and is used with ‘wanted’
not ‘enjoyed’.
Thus, option D is the correct answer.