The correct answer is D: in. The preposition 'in' is used with parts of the day such as morning, afternoon and evening. The standard collocation is 'in the morning'.
A.at
B.on
C.along
D.in✓ Correct
Explanation
The preposition 'in' is used with parts of the day such as morning, afternoon and evening. The standard collocation is 'in the morning'. Hence 'in' is correct.
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