People _________ rivers for transportation since the beginning of history.
#36687
A
used
B
have used
C
use
D
had used
推荐题目
---There__________ a concert of Justin Bibber in Zhuhai next month. Shall we go? --- Sure, I like him a lot.
#37943
A
are going to have
B
is going to be
C
is going to have
D
are going to be
----Where is your sister? -----She _________ my mom with cooking.
#41584
A
is helping
B
helping
C
is help
D
helps