There is no doubt ______ a large number of people have benefited from heart surgery.

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问题 There is no doubt ______ a large number of people have benefited from heart surgery.

选项 A、whether
B、if
C、that
D、what

答案C

解析名词性从句题。在doubt，doubtful后面的名词性从句中，如果主句为肯定句，从句连接词为whether或if，如：I am doubtful whether he is still alive．(我怀疑他是否仍然活着。)在否定或疑问句中，从句连接词要用that，因此C正确。

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专业英语四级

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专业英语四级

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