..............added to a liquid, antifreeze lowers the freezing temperature of ...

★ Adverb and Noun Clauses

…………..added to a liquid, antifreeze lowers the freezing temperature of that liquid.

A. That

B. As is

C. It is

D. When

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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