Topics: Noun Clauses
It was in 1875 _________________ joined the staff of the astronomical observatory at Harvard University.
A. that Anna Winlock
B. (Anna Winlock, who
C. as Anna Winlock
D. (Anna Winlock then
Select your answer:

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Which rules of using ‘A/An’ is correct?
A. A/An is used with unique nouns.
B. A/An is used to show job, status.
C. A/An is used with musical instruments.
D. A/An is used before morning, afternoon, evening, night.
