________many times,but he still couldn't understand it.
________many times,but he still couldn't understand it.
1.___many times,but he still couldn't understand it.
_____scores of times,but he still couldn't understand it.
____ many times but he still couldn't understand it
二.对比练习:1.________many times ,but he still couldn't understan
__many times,but he still couldn't understand
he had been told many times but he still couldn't understand
1.__________(tell) many times,he still couldn't understand.
( ) many times,but he still couldn't remember .
1.()many times,he couldn't understand it.
()many times,but he still could not understand it.
高中英语单选几道.1.________A_ many times,but he still couldn’t under