1.Half of the class ______ done most of the work .The left ____rather difficuit.A.have,is B.has,is C.have,are D.has,are2.The factory has been_________for two years.A.open B.to open C.opening D.opened

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1.Half of the class ______ done most of the work .The left ____rather difficuit.A.have,is B.has,is C.have,are D.has,are2.The factory has been_________for two years.A.open B.to open C.opening D.opened

1.Half of the class ______ done most of the work .The left ____rather difficuit.A.have,is B.has,is C.have,are D.has,are2.The factory has been_________for two years.A.open B.to open C.opening D.opened
1.Half of the class ______ done most of the work .The left ____rather difficuit.
A.have,is B.has,is C.have,are D.has,are
2.The factory has been_________for two years.
A.open B.to open C.opening D.opened

1.Half of the class ______ done most of the work .The left ____rather difficuit.A.have,is B.has,is C.have,are D.has,are2.The factory has been_________for two years.A.open B.to open C.opening D.opened
1 a class 是集体名词,和family等词的用法一样,可以指以一个集体,也可以指这个集体的成员.指集体的时候,谓语动词用单数,指集体成员的时候,谓语动词用复数.这个题里面,指的是班级的成员完成工作,所以谓语动词用复数.后面的the left 指的应该是the left work is difficult.
2 c open是短暂性动词,不能用于现在完成时态,这表示动作的持续,工厂还一直开着,所以用现在完成进行时.

cd

A.C 弟一题,CLASS为不可数名词!只能用have .is
弟二题,由for引导的现在完成进行时,表示OPENING还会进行下去

1.a
half of the class 是指一半学生要用have,the left指剩下的工作要用is
2.c
现在完成进行时