From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.
A．when B．untilC．sinceD．before
D
考查時(shí)間狀語從句。句意“有時(shí)候，在人們意識到有鱷魚之前，鱷魚會(huì)突然捉住他�！盇“當(dāng)”；B“直到”；C“自從”；D“在......之前”。故選D。
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