(单选题)
Large amounts of water ______ in the past five years.
A.were polluted
B.was polluted
C.has been polluted
D.have been polluted
参考答案:D
知识点:
(单选题)
Large amounts of water ______ in the past five years.
A.were polluted
B.was polluted
C.has been polluted
D.have been polluted
参考答案:D
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