问题
选择题
We have just heard a warning on the radio ________ an earthquake is likely to strike that area again.
A．which
B．what
C．that
D．when
答案
答案：C
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We have just heard a warning on the radio ________ an earthquake is likely to strike that area again.
A．which
B．what
C．that
D．when
答案：C
