—I think trees ____________ twice a week in such hot weather.—Yes, I agree. Or they may die without water.
#36181
A
must water.
B
are watered.
C
must be planted.
D
must be watered.
推荐题目
Mr Li ________ . 
#42495
A
teach me English
B
teach my English
C
teaches me English
D
teaches my English
---Is your father still in Shanghai? ---Yes, he _________there for two weeks.
#41753
A
has gone to
B
has gone
C
has been in
D
has been