科目: 来源:不详 题型:单选题
A.is | B.are | C.was | D.were |
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科目: 来源:不详 题型:单选题
A.is | B.are | C.was | D.were |
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科目: 来源:不详 题型:单选题
A.were; was | B.was; was | C.was; were | D.were; were. |
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科目: 来源:不详 题型:单选题
A.is | B.are | C.was | D.were |
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科目: 来源:不详 题型:单选题
A.is; are | B.is; is | C.are; is | D.are; are |
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A.A large amount ; were | B.Large amounts; were |
C.Large amount; was | D.A plenty; was |
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科目: 来源:不详 题型:单选题
A.are | B.is | C.will | D.was |
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科目: 来源:不详 题型:单选题
A.has been | B.was | C.have been | D.were |
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科目: 来源:不详 题型:单选题
A.have been polluted | B.has polluted |
C.have polluted | D.has been polluted |
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科目: 来源:不详 题型:单选题
A.Am; are | B.Are; are | C.Is; are | D.Is; is |
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