According to the rules of the factory, you can ask for leave ________ you have a doctor’s diagnosed(診斷) note.
A．now thatB．if C．unlessD．even though
B

試題分析：根據(jù)句意根據(jù)廠里的規(guī)章制度，如果你有醫(yī)生的診斷書(shū)，你才能請(qǐng)假。故選B
A.既然 B.除非…否則 D.即使
點(diǎn)評(píng)：本題注意unless一詞，unless一詞前面常要有否定意義的詞，句意才符合邏輯。例如：We will easily become unhappy unless we deal with our problem well.
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