问题
选择题
They were walking along the shore _______ a huge wave appeared out of nowhere, sweeping them out to sea.[ ]
A．as
B．while
C．when
D．though
答案
答案：C
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They were walking along the shore _______ a huge wave appeared out of nowhere, sweeping them out to sea.[ ]
A．as
B．while
C．when
D．though
答案：C