{01}______ he has made a decision, it is not easy for you to make him change his mind.
A.Though
B.Unless
C.Until
D.Once
解析: 试题分析:连词辨析。A尽管;B除非,如果…不…;C直到…才;D一旦;句意:一旦他做出了决定,对你来说让他改变主意是很不容易的。根据句意说明D正确。 点评:对于连词的辨析要放在上下文语境中进行,本题的B项是考查的重点,要注意unless可以换成if…not的结构。 本题选D。 {02}Scientists study ___________ human brains work to make computer.
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