Many rivers ________. [ ]A. have became polluted B. have become polluted C.
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Many rivers ________. |
[ ] |
A. have became polluted B. have become polluted C. have been polluting D. have become polluting |
答案
B |
举一反三
Your son is old enough to _____ himself. |
[ ] |
A. wear B. dress C. put on D. have on |
The film ________ for five minutes when she got there. |
[ ] |
A. has begun B. has been on C. had begun D. had been on |
The traffic accident _____ a large crowd. |
[ ] |
A. charmed B. signal C. call D. attracted |
— May I _____ your dictionary for a moment? — Sure. |
[ ] |
A. borrow B. lend C. get D. keep |
_____ your parents are not at home. What should you do? |
[ ] |
A. Try B. Be supposed C. Suppose D. Think |
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