---Does he work hard at his lessons?---Yes, he spares no efforts, _______.A.I don't need to sayB.this is clearC.if I dare to say soD.I dare say
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D解析dare可用作实义动词，但在用作实义动词后接不定式时不定式可带to也可不带to，因此可以说I didn't dare try a shot. 另外，How dare you…? 是表示愤怒时使用的句式，I dare say. 表示“也许，我想是这样”．