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20.People around the country were excited __________ the astronauts came back to the earth safely.(  )
A.unlessB.butC.untilD.because

分析 句意:全国各地的人们都很激动,因为宇航员安全地返回地球.

解答 答案:D.根据People around the country were excited (全国各地的人们都很激动)和the astronauts came back to the earth safely(宇航员安全地返回地球)可知前后是因果关系,四个选项的含义分别是A.unless除非; B.but但是;C.until直到;D.because因为.故D正确

点评 考查从属连词.
1.because 是连词,其后接句子,例 如:
He is called Mitch,because his name is Mitchell.
2.because of 是复合介词,其后接名词、代词、动名词、what 从句等.例如:
We could see him wasting away because of his illness.

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