Fruit and vegetables are good for us. We need them __________ healthy.
#48814
A
keep
B
keeping
C
to keep
D
keeps
推荐题目
— I hear you have got an opportunity _________ at the children’s hospital.— Yes, I love children and it will be a good experience for me.
#50974
A
to volunteer
B
helping
C
volunteering
D
to teach
—I left my keys in my office. Could you help me ___ them?—OK．I’ll do it at once．
#51291
A
take
B
bring
C
fetch
D
carry
Although we’ve learned English for years, we have trouble _____ the foreigners.
#50181
A
understand
B
to understand
C
understanding
D
of understanding