— Why does the lake smell terrible?— Because large quantities of water ____.
#85686
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
推荐题目
_______ good for our health.
#43570
A
Do exercise is
B
Doing exercise is
C
Do exercises are
D
Doing exercises are
A poet and artist going to speak tomorrow afternoon to us about Chinese literature.
#85923
A
is
B
are
C
was
D
were
Large quantities of time ______ for practising guided writings.
#85977
A
was needed
B
are needed
C
needs
D
is needed