The town’s drinking-water _____ with prim chemicals at present.
#104183
A
contaminates
B
is contaminated
C
is being contaminated
D
has been contaminated
推荐题目
I know Mr. Shuili; we ______ to each other at an English lecture.
#102636
A
are introduced
B
are been introduced
C
were introduced
D
had been introduced
When I arrived at the station, I found the train _________ for passengers. 
#103476
A
waited
B
had been waiting
C
would wait
D
wait
——You see how thin Ann is!——She ______ gain some weight but she______ too little.
#99970
A
would; ate 
B
will ; eats 
C
would ; has eaten 
D
will ; is eating
It is five years since my dear aunt _______ here.
#104190
A
left
B
has left
C
is left
D
had left