I ______ in Guangzhou for six years by this October.
A. have lived
B. was living
C. will be living
D. shall have lived
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I don't know when he ______, but when he ______, I'll let you know.
A. will come/comes
B. comes/will come
C. comes/comes
D. will come/will come
Every time I _____ there, I will buy him something nice.
A. went
B. will go
C. go
D. have gone
Iwastoldthatthepressconference heldthenextday.
A. were tobe
B. has tobe
C. istobe
D. wastobe
常用螺纹联接中,自锁性最好的螺纹是。
A. 三角螺纹(普通螺纹)
B. 梯形螺纹
C. 锯齿形螺纹
D. 矩形螺纹