问题
选择题
He had travelled only seven miles across the Channel ___ his engine failed and he was forced to land on the sea.
A．before
B．while
C．when
D．it
答案
答案：C
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He had travelled only seven miles across the Channel ___ his engine failed and he was forced to land on the sea.
A．before
B．while
C．when
D．it
答案：C