___many times,but he still could not understand it.

1.___many times,but he still couldn't understand it. （）many times,but he still could not understand it. ___ many times but he still could not understand it.(tell) ______ many times,he still could not understand it. ___ ,but he still could not understand it ____ but he still could not understand it. _____scores of times,but he still couldn't understand it. ____ many times but he still couldn't understand it ________many times,but he still couldn't understand it. ( )many times, but he still could not rem __many times,but he still couldn't understand 英语单选7题,1____several times about it ,but he could not give th