大全885补充247老题新问

885-补充-247
247. The president of the block association tried to convince her neighbors they should join forces to prevent crime in the neighborhood rather than continuing to be victimized.
(A) they should join forces to prevent crime in the neighborhood rather than continuing to be victimized
(B) they should join forces to prevent crime in the neighborhood rather than continue to be victimized
(C) about joining forces to prevent crime in the neighborhood instead of continuing to be victimized
(D) for the joining of forces to prevent crime in the neighborhood rather than continue to be victimized
(E) to join forces to prevent crime in the neighborhood rather than continuing to be victimized
答案:B,  那么就是说convince sb(that) + 句子, 有人说这里的that 可以省略是什么道理？

我只听说过THAT在从句中做宾语的话可以省略，这题不属于这种情况，为什么可以省略呢？

另外还有什么其他情况THAT可以省略的？