因为被提醒过路面结冰，我们以平时一半的速度行驶。
Having been warned about the icy roads, we drove at half the usual speed.
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having英 /ˈhævɪŋ/|美 /ˈhævɪŋ/
been英 /biːn/|美 /bɪn/
warned英 /wɔːnd/|美 /wɔrnd/
解释
having been warned 是被动非限定完成分句，置于句首为主句提供因果解释。
Having been warned about the icy roads, we drove at half the usual speed.
having been warned 是被动非限定完成分句，置于句首为主句提供因果解释。