问题

_ important for us _wild animals and birds.

A:Did; helped
B:Does; helped
C:Does; helps
D:Did help;

正确答案是：

同类题型

It is amazing that the little boy can swim ________the river ________100 meters wide

______ we can’t remove our troubles in life for ever, we can leave them behind when we are on vacation[ ]

Who will succeed his property after his death?[ ]

ws that he fought with his coach surprised us,________

His father told him ________ his best friend to dinner this Sunday.