— How long_________in Hong Kong?  — For just the weekend. I’ll be back next Monday morning.  
#102400
A
have you stayed
B
are you staying
C
did you stay
D
do you stay
推荐题目
Unfortunately, when I dropped in, Professor Smith ________, so we only had time for a few words. 
#104738
A
has just left
B
had just left
C
just left
D
was just leaving
Large quantities of oil      in a place near my hometown recently. 
#102718
A
has discovered
B
have discovered
C
has been discovered
D
have been discovered
In the past,ice ______food.
#104372
A
used to keep
B
used to be used for keeping
C
was used to keeping
D
used to be used to keeping
—Have you moved into your new classroom building? —Not yet, it ______________.
#99299
A
was painted
B
is painted
C
has been painted
D
is being painted