1.Nobody noticed the thief slip into the house because the lights happened to ___
问题描述：
1.Nobody noticed the thief slip into the house because the lights happened to ___
A.be put up B.give in
C.be turned on D.go out
2.The new bridge __ by the end of last month
A.has been designed B.had been designed
C.was designed D.would be designed
3.When part of a pencil is in a glass of water,it looks as if it__
A.breaks B.has broken
C.was broken D.had been broken
答
1.D
解析：这句话的意思是没人注意到小偷溜进了屋子因为灯正好灭了
A.put up 建造；张贴；提高；投宿；提出B.give in 认输,投降,屈服；交上,呈上C.turn on 接通,打开D.go out 外出；过时；(潮)退,(灯)熄,终止；公布
2.A
解析：这句的意思是这座新的大桥将于上月月底建好,根据语意可以知道应该用现在完成时.而且,这座桥对现在有影响即人们要使用它,所以用现在完成时A.
3.C 如果是were broken更好,不过口语里可以用was.
解析：as if 是看起来,实际未发生,它引导了一个虚拟语气,而因为是一般现在时,现在时的虚拟语气要用were +动词过去分词引导 所以应该选C
不懂可以再问哈