It’s necessary for us     every subject well. 
#47007
A
learn
B
learns
C
learning
D
to learn
推荐题目
It _______ we had stayed together for a couple of weeks _______ I found we had a lot in common.
#85396
A
was until;when
B
was until;that
C
wasn’t until;when
D
wasn’t until;that
I can’t remember ______ I met the man. 
#85471
A
where was it
B
it was where  
C
where it was that
D
where was it that