What shall human beings do if oil        sometime in the future?
#101364
A
will run out
B
runs out of
C
runs out
D
will be run out
推荐题目
He _____ football regularly for many years when he was young.
#101712
A
played
B
was playing
C
has played
D
had played
When the old man_____to walk back to his house,the sun____itself behind the mountain.
#103518
A
was starting;hid
B
had started;had already hidden
C
had started;was hiding
D
started;had already hidden