问题

Plastic bags are provided for our convenience but they have also ___ the pollution of the environment.[ ]

A: adapted to
B: turned to
C: contributed to
D: looked forward to

正确答案是：

同类题型

I’ll give you y friend’s home address ______ I can be reached most evenings.

I like _______ of the two books, because it’s more interesting.

Two years has passed since I ______you thefirst time

hid himself behind the door, from__________ he could hear the steps of his father clearly

Is there a supermarket around ______ I can buy a pair of new shoes