If Aan astronomer looks at Bstar that is Cone hundred light years away, Dthe lig

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问题 If Aan astronomer looks at Bstar that is Cone hundred light years away, Dthe light that can be seen is one hundred years old.

选项 A、
B、
C、
D、

答案 B

解析 Star is an indefinite singular countable noun that needs an article. Correction: a star.

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[originaltext]Todaymostastronomersacceptthenotionthatgroupsofstarstha