单选题
Pumas, which are large, cat-like animals, will not attack human beings if they ______ undisturbed.
问题1选项
A.leave
B.left
C.are left
D.have left
A.leave
B.left
C.are left
D.have left
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Pumas, which are large, cat-like animals, will not attack human beings if they ______ undisturbed.
