单项选择题

You should discuss your idea with your classmates because just ______ it to someone else helps you sort it out for yourself.

A. have to explain
B. having to explain
C. have explained
D. having explained
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单项选择题
You will see this product ______ wherever you go in this city.
A. advertise
B. to be advertised
C. advertised
D. advertising
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