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【单选题】

.Despite UNICEF’s efforts, dirty water ______ for disease spreading in southern Iraq at the very moment.

A.
is to be blamed
B.
is being blamed
C.
has been blamed
D.
was blamed
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参考答案:
参考解析:
.
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【单选题】—Mom, I did not pass the exam.—What a pity! Youit.

A.
can pass
B.
should have passed
C.
must pass
D.
must have passed