He to Leshan many times, so he knows every corner of it.A. went B. will go C. has been
Don’t ___________ your dictionary all the time when you meet new words.
It is difficult __________ you ___________ finish the work in a week.
I can’t understand ____________ the boy alone.
They asked many questions ___________ had nothing to do with that topic.
_____________ is necessary __________ he trains himself before the Guangzhou Marathon.