题干

在△ABC中,若b=2asinB,则A等于(   )

A:30∘或60∘

B:45∘或135∘

C:120∘或60∘

D:30∘或150∘

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答案(点此获取答案解析)

B

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In the Spring Festival, Jonny sent each of his classmates a card with best wishes, but he received ________.