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Why is debate important？

• A、It helps people understand others better.

• B、It allows people to present their opinions.

• C、It develops one' s thinking and communicative competence.

• D、It gives one the opportunity to brush others' opinion aside.

58（）

John complained to the bookseller that there were several pages______ in the dictionary.

• A、lacking

• B、losing

• C、missing

• D、dropping