问题
My friends went to summer camp _______ vacation. [ ]
A: at
B: on
C: in
D:for
B: on
C: in
D:for
正确答案是：
同类题型
Who’s your Chinese teacher?–Miss Zhang. She has taught ______ Chinese for two years.
Look! The trailwalkers are walking with ______ bodies. The walk must be very______.
He is believed____________ in at his office on his way home.
_________that we will _______free computer training during the holidays.