问题
选择题
I had walked a few steps _______ I realized that I was lost in the thick fog.
A．unless
B．Before
C．When
D．since
答案
B
before表示“还没……就……”
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I had walked a few steps _______ I realized that I was lost in the thick fog.
A．unless
B．Before
C．When
D．since
B
before表示“还没……就……”