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【单选题】
My aunt isn't here. She _____ Shanghai on business. She will be back in three days. [     ]
A.
went
B.
has gone to
C.
has been to
D.
will go to
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【简答题】Last Sunday my father and I went fishing along a river. We found the water very dirty that we could hardly catch any fish in it. A lot of factories along the river always poured their waste water and ...
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