He was so busy ____ his homework that he forgot to have supper.
#49628
A
to do
B
do
C
doing
D
does
推荐题目
Your son has kept _________ for two hours. You’d better ask him to have a rest.
#51156
A
study
B
studied
C
to study
D
studying
--- You look ______,Paul. What’s the matter?--- I’m having trouble ______ math.
#51056
A
tired, to learn
B
worried, learning
C
frustrated, to learn
D
angrily, learning
