27. All things ____ the planned trip will have to be called off A. considered B. be considered C. considering D. having considered 选A...为什么?

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27. All things ____ the planned trip will have to be called off
A. considered B. be considered C. considering D. having considered
选A...为什么?

原文意思应该是:
被认为是计划好的旅行的所有事情不得不被取消.
所以应该填which are considered
结构是:
All things(which are considered the planned trip)will have to be called off,括号里表示定语从句
而which are 可以省略,故选A