题目内容
All the guests at the party were dancing and singing happily _____ the electricity was cut off.
| A．until | B．while | C．when | D．because |
C
解析试题分析：句意：当电源被切断后，聚会上的所有客人都高兴地又唱又跳。Until直到；while然而；when当……时候；because因为，选C。
考点：考查连词辨析
The past year has seen people around the world honoring Nelson Mandela, _____ passed away on Dec 5 at the age of 95.
| A．who | B．which | C．that | D．when |
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| A．which | B．what | C．that | D．if |
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| A．while | B．when | C．yet | D．although |
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| A．unless | B．when | C．until | D．before |
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| A．before | B．until | C．once | D．though |
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| A．when | B．that |
| C．what | D．where |
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| A．so that | B．no matter how |
| C．as long as | D．except that |