[ Geography ]

What is the time required for the Earth to return to a given orbit with reference to a fixed solar star?

A. Lunar year
B. Solar year
C. Tropical year
D. Sidereal year

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I ______ (study) non-stop ______ 9:15.

A. I have studied non-stop since 9:15.
B. I have studied non-stop for 9:15.
C. I has study non-stop since 9:15.
D. I has study non-stop for 9:15.

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