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参考答案：错
There was a tree in front of the house, ___ owner was seen sitting under it, enjoying the shade.
A．whose
B．where
C．which
D．that
隔离的种类有8种，指严格隔离，接触隔离，呼吸道隔离，昆媒隔离和_____，_____，_____，_____。
