[ Grammar ]
The factory was accused ____ having caused higher level of pollution to the environment.
A. about
B. on
C. of
D. for
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Grammar › ViewDo you know anything about ________________ stamps?
A. collecting
B. to collect
C. collect
Grammar › View
My uncle has built a concrete wall _________ his house.
A. over
B. above
C. around
D. through