It was in 1875 _________________ joined the staff of the ...

★ 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

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Do you know __________ from the earth?

A. how far the moon is

B. if how far the moon is

C. how far is the moon

D. whether how is the moon far