While the boy ______ down the street, the UFO _____ . 
#41890
A
was walking; was landing
B
walked; landed
C
was walking; landed
D
walked; was landing
推荐题目
 Listen! Someone______ an English song now.
#37795
A
sings
B
sang
C
is singing
D
was singing
It        when I        my homework last night.
#40154
A
raining, did
B
rained, was doing
C
was raining, do
D
rains, was doing
   ---     Bob doing homework?---No, he isn’t. He is        a letter.
#41826
A
Does, writes
B
Is, writes
C
Does, writing
D
Is, writing
—I called you last night, but no one answered me.—Oh, I________ a shower.
#36468
A
have taken
B
was taking
C
took
D
will take