B．When C．While

　　D．Unless

　　4．C。while表示“尽管”。 ()5.________in the past, at the moment it is a favorite choice for wedding gown. A．Unpopular has as white been

　　B．White has been as unpopular C．Unpopular has been as white

　　D．Unpopular as white has been 5．D。as引导让步状语从句，相当于Though white has been unpopular。

　　()6.I felt somewhat disappointed and was about to leave ________ something occurred that attracted my attention. A．unless

　　B．until

　　C．when

　　D．while 6．C。be about to do sth when...“正要做……时突然”。

　　()7.How can they expect to learn anything ________ they never listen? A．when

　　B．until C．unless

　　D．though 7．A。when表示“在……的情况下”。

　　()8.It was decades ago ________ I was in my teens ________ the Chinese government decided to reform the social economic system. A．when; when

　　B．that; which

　　C．when; that

　　D．before; that 8．C。when引导时间状语从句，二十年以前当我十几岁的时候。It was...that是强调句型。

　　()9.The process of producing electricity may also give out CO2, ________ you heat your house with electricity instead of charcoal. A．even if

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