1. This is the biggest laboratory _____ we have ever built in our school.
A. which
B. what
C. where
D. /
2. Is oxygen the only gas _____ helps fire burn?
A. that
B. /
C. which
D. it
3. Is there anything _____ to you?
A. that is belonged
B. that belongs
C. that belong
D. which belongs
答案:D A B
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