The workers didn't know what __(引起)the big fire.
问题描述:
The workers didn't know what __(引起)the big fire.
答
caused
gave rise to
答
caused
注意时态前后一致
答
The workers didn't know what _caused_(引起)the big fire.
填 cause 的过去式 caused
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答
caused ,cause的过去式,引起