[ Grammar ]
It was clear that a chemical factory had __________the pollution in the local rivers.
A. caused
B. had
C. made
Select your answer:
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Vocabulary › ViewA hint in the surrounding text that can help a reader infer the definition
A. definition
B. context clues
C. example
D. contrast
Grammar › View
Please send us a postcard as soon as you______in London.
A. will arrive
B. is going to arrive
C. arrive
D. arrived
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