题文
From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.
| A．when | B．until | C．since | D．before |
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From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.
| A．when | B．until | C．since | D．before |
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