英语知识运用 从A、B、C、D四个选项中,选出可以填入空白处的最佳选项． 1.She had three sons,al

英语知识运用
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项．
1.She had three sons,all____ became doctors.
A) of whom B) which
C) of which D) who
2.It is time the kids______.
A) go to bed B) have gone to bed
C) went to bed D) had gone to bed
3.Eleven o'clock is____ for a boy of his age to stay up.
A) a so late hour B) so late an hour
C) an hour too late D) too late an hour
4.The American ignorance of Australian literature was often____ by a belief that Australia is as isolated culturally as it is geographically
A) accompanied B) carried
C) separated D) prevented
5.My idea is that the instrument_____ again before it is used.
A) is tested B) will be tested
C) should be tested D) tests