圆截面直杆，直径为d，长度为l，自由端受力如图所示。为进行强度计算，须从受力构件的危险截面上的危险点处截取出一单元体，若不计弯曲剪力的影响，该点处原始单元体的应力状态是______。

A.had seen

B.see

C.saw

D.have seen

A: This toothache is killing me.

B: If I am right, this is the third time you've had it this month.

A: You are right.

A．It's all right.

B．It'll be gone.

C．I have no method.

D．I'm fed up with it.

Not until I reminded him for the third time ______ working and looked up.

A．that he stopped

B．does he stopped

C．did he stop

D．that he stop

Not until I reminded him for he third time ______ watching TV and went to bed.

A．that he stopped

B．does he stop

C．did he stop

D．that he stops

Not until I reminded him for the third time ____working and looked up.

A. that he stopped B. does he stopped C. did he stop D. that he stopped

He had read the text twice,but the teacher asked him to read it ______ ．

A．a third time B．the third time C．third times D．three times

It is the third time that I ______ here.

A．was

B．am

C．have been

D．had been

Which of the following is a compound-complex sentence？

A．If you want me to clean your windows, please give me a week's notice, for I am very busy this month.

B．Please give me a week's notice and then I'll come to clean your windows in time, because I am very busy this month.

C．If you want me to clean your windows and have them repaired, please give me a week's notice.

D．Please give me a week's notice and then I'll come to clean your windows in time, for I am very busy this month.

I asked him not (say) ______ anything about our contract until the end of the month.