It’s only when we have left school or college that we understand the greatness of our opportunity of education, which has gone for ever.请问which所引导的从句的先行词是？
有一道选择题：—Did you telephone the manager’s office?—Yes. He _______ back before 9 o’clock this morning.A. was expected B. expected C. is expecting D. is expected答案给的是A，也有给D的。到底是哪个呢？求解答...
For nearly ten years, he did very few interviews or concerts. His simple life might have continued but for the great musician. 这里的did是强调过去的实事，而不是持续的状态？might have done 这里是虚拟的用法，而不是陈述语气对吗？
如：And we’re miserable. And we’re miserable not because the other guy can’t run a good meeting, it’s because of MAS, our Mindless Accept Syndrome, which is a self-inflicted wound.
There's a vague promise in the background that he once delievered a roaring economy he'll bring it right back.1）上句that he once delievered a roaring economy是promise的同位语吗？2）he'll bring it right back. 前少了一个并列连词and的吧？
...marked by trade uncertainty and now a global pandemic, many farmers acorss the country stillsupported President Donald Trump.上句marked by这里的mark究竟是什么意思呢？另外，顺便请教老师为什么tumultuous在four前，而不是four tumultuous years ?
A massage and a wave and a collar for the dog and one of those cute
little ash-trays where you touch a spring, and a wreath with a black silk bow
for mother’s grave that’ll last all summer.ash-trays后面的where怎么理解比较容易懂，这里的where也是表示地点的状语从句吗？