Have sports training every day, ______you won’t be healthy in the future.

A．because B．or C．unless D．since 

B

解析試題分析：句意：每天開(kāi)展運(yùn)動(dòng)訓(xùn)練天，否則你將來(lái)將不健康。Because因?yàn)椋籵r或者，否則；unless除非；since自從。根據(jù)前后分句句意可知該選B。
考點(diǎn)：考查連詞。

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