The small hours

[samia]

Test No. express/advan-5 "Call it a day", question 2

Some of you worked on until the small hours to make it a successful project.

(a) it was dark outside
(b) it was early in the morning
(c) it was late in the evening
(d) it was late in the day

Test No. express/advan-5 "Call it a day", answer 2

Some of you worked on until it was early in the morning to make it a successful project.

Correct answer: (b) it was early in the morning
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i want the part of speech of the word "Morning"

[Alan]

This is a noun.
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English as a Second Language
You can read my ESL story A day in the life of a driving instructor