There      serious air pollution if people use more and more cars.
#36558
A
has
B
will be
C
will have
D
are going to be
推荐题目
He promised to pick me up at the school gate. However. he    __ yet.
#42316
A
didn’t arrive
B
doesn’t an’lye
C
isn’t arriving
D
hasn’t arrived
 There      serious air pollution if people use more and more cars.
#36558
A
has
B
will be
C
will have
D
are going to be