He ____ some cooking at that time, so _____ me
A. did,heard
B. did,didn't hear
C. was doing, heard
D. was doing, didn't hear
查看答案
This time yesterday jack _____ his bike. He _____ TV
A. repaired, didn't watch
B. was repairing, watched
C. repaired, watched
D. was repairing, wasn't watching
His parents wanted to know how he _____ on with his new classmates.
A. was getting
B. gets
C. is getting
D. will get
节点B受到几个力的作用
A. 1个
B. 2个
C. 3个
D. 4个
图示结构中( )是二力构件。
AB杆
BC杆
CD杆
D. AB和CD杆
微信支付 
支付宝支付