If you________first aid correctly,the old man would be saved.
#87651
A
offered
B
do
C
know
D
give
推荐题目
-Why didn’t Susan come to see us yesterday as she promised?-______. 
#87312
A
She must be busy
B
She might have been free
C
She must have been busy
D
She can’t be free
______ him well, I would have invited him to my birthday party.
#87956
A
Had I known
B
Should I know
C
If I know
D
If I knew