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【单选题】
由于岩石的抗压强度远大于它的抗拉强度，所以一般情况下，岩石属于（ ）。A.
脆性材料
B.
延性材料
C.
坚硬材料
D.
脆性材料，但围压较大时，会呈现延性特征
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A.
knew
B.
have known
C.
had known
D.
know
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【简答题】We could see the house ______ (not clean)for years．
【单选题】— You seem familiar with Mr. John? —Of course, we _________ together for three years in the 1990s.
A.
have worked
B.
were working
C.
are working
D.
worked
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