问题描述：
We must get up early tomorrow,_________ we'll miss the first bus to the Great Wall.A.so B.or C.bu
We must get up early tomorrow,_________ we'll miss the first bus to the Great Wall.A.so B.or C.but D.however
We must get up early tomorrow,_________ we'll miss the first bus to the Great Wall.A.so B.or C.but D.however
问题解答：
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