b) last Friday, work will begin
I think the correct option is option b which is last Friday, work will begin this is because while speaking this sentence we need a little pause
The correct options that can complete the sentence are B. 'last Friday, work will begin' and C. 'last Friday; work will begin'. However, option B is the most conventional choice for clear reading. The use of a comma in option B is preferred for connecting the clauses smoothly.
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