Every possible means ________ to prevent the air pollution, but the sky is still
题型:同步题难度:来源:
Every possible means ________ to prevent the air pollution, but the sky is still not clear. |
[ ] |
A. is used B. are used C. has been used D. have been used |
答案
C |
举一反三
— What have they made up their minds to do during the summer vocation? — They ______ to cycle around the country on their own. |
[ ] |
A. are determined B. are decided C. have determined D. have been decided |
This is the first time that I_________ at the meeting. |
[ ] |
A. had spoken B. have spoken C. am D. was |
It"s the second time you _______ late this week. |
[ ] |
A. arrive B. arrived C. have arrived D. had arrived |
— You shouldn"t have talked back to our teacher like that. It was awfully impolite. — You are right. I ______ crazy at that moment. |
[ ] |
A. must be B. could have been C. must have been D. should have been. |
By the time he realizes he _____ a mistake, it" ll be too late for him to change his mind. |
[ ] |
A. makes B. made C. has made D. had made |
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