It’s necessary for us     every subject well. 
#47007
A
learn
B
learns
C
learning
D
to learn
推荐题目
This river has changed its course many times. It _________ always located where it ________ at present.
#85380
A
isn’t; is
B
isn’t; will be
C
wasn’t; is
D
wasn’t; has been
______ in a small temple ______ Dr. Bethune saved the wounded solider.
#85364
A
It was, which
B
It is, where
C
It was, that
D
It is, that