You'd better take these documents with you __ you need them for the meeting.

• A、unless

• B、in case

• C、until

• D、so that

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.

56（）