1.__b___at the town hall.the president was warmly welcomed by the mayor.
a.to arrive b.on arriving c.arrived d.have arrived
2.I wish he _c__me tomorrow.I am so busy now
will visit b.will be visiting c.visited d.would have visited
3.how careless ____john____the pretty vase.
a.it was of…to have broken
b.was of…to break
c.it was for…to have broken
d.of…to break
4.-mom,what did your doctor say?
-he advised me to live _d__the air is fresher.
a.in where b.in which c.the place where d.where
第一题的c和d为什么不能用