【題目】There is no doubt _____ humans should protect the environment.
A.that
B.which
C.what
D.why

【答案】A
【解析】 考查固定句型； 句意：毫無疑問人類應(yīng)該保護(hù)環(huán)境。There is no doubt that 毫無疑問，故選A項。

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