问题
选择题
We were swimming in the lake__________suddenly the storm started.
A．when
B．while
C．until
D．before
答案
A
when 在句中是并列连词，作“正当这时”解，相当于at that time (suddenly)。
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We were swimming in the lake__________suddenly the storm started.
A．when
B．while
C．until
D．before
A
when 在句中是并列连词，作“正当这时”解，相当于at that time (suddenly)。