题目内容
(请给出正确答案)
[单选题]
It is not safe to swim in the sea,so Susan's mother asked her to()it.
A.invite
B.draw
C.avoid
D.join
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A.invite
B.draw
C.avoid
D.join
Try to explain Singleton to us? Is it thread safe? If no, how to make
it thread safe?