英语倒装句

Question

1.so little () about this theory that the lecture was totally beyond me.
A.did i konw B.I knew C.I had known D.had i konwn
2.only after he has learned this skill()to operate the machine.
A.he began B.did he begin C.will he begin D.must he begin
第一题为什么用did，第二题为什么用will？

Answer 1

第一句 选 A
要和后面的从句保持一致（so....that 结构），太.....以至于......
翻译：So little did I knew about this theory that the lecture was totally beyond me.
我对这一理论知之甚少，以至于演讲完全超出了我的理解范围。
第二句选 C
he will begin to operate the machine.（他将开始操作这台机器）这个动作发生在 after he has learned this skill（在他学会了这个技能之后，要注意这是一般时态）的后面，所以用将来时态
翻译：Only after he has learned this skill will he begin to operate the machine.
只有在他学会了这项技能之后，他才开始操作这台机器。