单项选择题

Many traffic accidents have happened here, but nobody can account for them.

A．这里发生过许多交通事故，但是没有人亲眼目睹这些事故。
B．这里发生过许多交通事故，但是没有人能说明这些事故的原因。
C．这里发生过许多交通事故，但是没有人能对这些事故讲得清楚。
D．这里不曾发生过交通事故，但是没有人能追究这些事故。
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