【C10】
A．As
B．Which
C．That
D．Who
请帮忙给出正确答案和分析，谢谢！
【C6】A．whereB．whichC．thatD．as
A．whatB．whichC．thatD．since
【29】A．whatB．whichC．thatD．if
【C19】A．asB．whichC．thatD．when
【C6】A．thoseB．whichC．thatD．what
______ we all know air is gas.A.AsB.WhichC.ThatD
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