B．unless

　　C．before

　　D．as 1．C。考查状语从句引导词的选用。句意：他犯了错，但及时采取了补救措施，没让事情变得更糟。

　　()2.The consequences of our actions are unbelievably complicated and diverse ________ predicting the future is a very difficult business indeed. A．because

　　B．even if

　　C．in order that

　　D．so that

　　2．D。so that 引导结果状语从句，根据句意应该选so that。

　　()3.________ makes his parents proud is ________ he never gives up，________ difficult the situation is. A．Whatever；不填；however

　　B．What；不填；how

　　C．What；that；however

　　D．Whatever；that；how 3．C。第一空what 引导主语从句，第二空that 引导表语从句，第三空however 引导让步状语从句，相当于no matter how。

　　()4.What we have been doing may not do us much good，but ________ it will benefit us or others，we'll just stick it out. A．no matter

　　B．however

　　C．whether

　　D．although 4．C。whether 与or连用，引导让步状语从句，相当于no matter whether。

　　()5.It's quite a time ________ the player got injured，but it won't be long ________ he returns to the court. A．since；before

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