题目内容
They ________ many bridges _________ the Pearl River in the last 10 years.
[ ]
|
A .have built; over |
B .built; over |
|
C .have built; on |
D .were building; on |
答案:A
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| A.polluted, must do | B.had polluted , must be doing |
| C.have polluted , must be done | D.were polluting, must be done |