Many people prefer large cars, large cars are safer than small ones. A. thinkingB. to thin

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(答案→)A. thinking
B. to think
C. think
D. having thought
解析：句意：许多人更喜欢大车，他们认为大车比小车更安全。空格前是一个句子，又没有连词，所以空格后应是非谓语动词，故排除C项。根据句意think与主语pepole之间是主动关系，作伴随状语，故用thinking。to think表示将来，发生在prefer动作之后，having thought发生在prefer动作之前。故选A。