问题
选择题
If you come，you must be prepared to keep moving，______ it is too cold to stand and watch for long.[ ]
A．as
B．when
C．if
D．unless
答案
答案：A
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If you come，you must be prepared to keep moving，______ it is too cold to stand and watch for long.[ ]
A．as
B．when
C．if
D．unless
答案：A