【题目】— Cloning can lead to many complicated problems.
— __________. That's why a lot of people are strongly against it.
A.That's it
B.Nonsense
C.That's all right
D.What a pity

【答案】A
【解析】考查上下文搭配。句意：克隆会导致许多复杂的问题。That's it就是这样，这就是为什么很多人强烈反对它。故选A项。