The head of the company promised to deal with matters of this sort----he returned to his officeA .until B.while C.by the time D.the moment 我想选C 想请问一下为什么 另外 the moment和 by the time 用法上有什么区别》》》谢谢!

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The head of the company promised to deal with matters of this sort----he returned to his officeA .until B.while C.by the time D.the moment 我想选C 想请问一下为什么 另外 the moment和 by the time 用法上有什么区别》》》谢谢!
The head of the company promised to deal with matters of this sort----he returned to his office
A .until B.while C.by the time D.the moment
我想选C 想请问一下为什么 另外 the moment和 by the time 用法上有什么区别》》》谢谢!

The head of the company promised to deal with matters of this sort----he returned to his officeA .until B.while C.by the time D.the moment 我想选C 想请问一下为什么 另外 the moment和 by the time 用法上有什么区别》》》谢谢!
the moment 后面的从句的时态跟主句一致.而by the time 后的从句跟主句不一致.这题如果用by the time 前面要用 had promised.

the moment 引导时间状语从句相当于 when
用by the time+过去时,主句往往用过去完成时

the moment 相当于when。这里应该用the moment ,表示这个公司的领导答应去处理这个问题当他回到他的办公司。在说,by the time 表示到什么时候,如果用它的话句子要用完成时态