They own two cars, not to a motorbike.A. speakB. sayC. talkD. mention

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A. speak
B. say
C. talk
(答案→)D. mention
解析：但其含义区别甚大：not to mention＝更不用说，此外还有：not to say＝虽不能说，即使不能说。如：It is warm, not to say hot. 　天气虽说不上热，但也够暖了。