-- I have got a headache. -- No wonder. You_________ on the math exercises too long.
#63776
A
work
B
are working
C
have been working
D
worked
推荐题目
—What's the matter with Philips?—Something must have happened to him. He left home three hours ago, but ________ at the party!
#63762
A
didn't arrive
B
isn't arriving
C
hadn't arrived
D
hasn't arrived
I got caught in the rain and my suit _______.
#63795
A
has ruined
B
had ruined
C
has been ruined
D
had been ruined
Up to now, our society ________ with limited living space and a shortage of natural resources.
#63760
A
has been challenged
B
is being challenged
C
is challenging
D
has challenged
—Why，Jack，you look so tired!—Well，I ________ the house and I must finish the work tomorrow.
#63774
A
was painting
B
will be painting
C
have painted
D
have been painting