1、John said he'd been working in the office for an hour,＿was

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1、John said he'd been working in the office for an hour,＿was true.
A、he B、this C、which D、who
2、＿in thought,he sat still in the sofa.
A、losing B、having lost C、lost D、to lose
3、The research is so designed that once＿nothing can be done to change it.
A、begins B、having began C、beginning D、begun
希望能得到比较详细的答案
题一中B为什么不行？
题二中B为什么不行？
题三中B为什么不行？

CCA
由于是逗号,是一句话不是两句.只能填which不能真this.故选C
lost指He was lost in thought.简化为lost in thought故选C
once 后面承前省了主语.省掉了The research ...
应为once (the research) begins 故选A

1、John said he'd been working in the office for an hour,＿was John said he'd been working in the office for an hour,___was John said he'd been workng in the office for an hour,( ) was John said he`d been working in the offic for an hour ,_____w 解答一些英文题：John said he'd been working in the office for an hou He said he was working in his office at the time of the crim The teacher had John _at the door for an hour beacuse he was We are going to stay in the office for( )hour.A.a B.an C./ D 1道高中英语单选Although we have been working in the same office for he has been in the cinema for an hour是什么时态, I have been working for an hour. I have working for an hour. Lucy has been in the phone for half an hour.