_______________ in several early civilizations, a cubit was based on ...

★ TOEFL

_______________ in several early civilizations, a cubit was based on the length of the forearm from the tip of the middle finger to the elbow.

A. It was used as a measurement

B. A measurement was used

C. The use of a measurement

D. Used as a measurement

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___________ of precious gems is determined by their hardness, color, and brilliance.

A. The valuable

B. It is the value

C. It is valuable

D. The value