Unit3 Computers(一 )课后练习
主讲教师：麻雪玲 北京市英语教师
题一：
I would question the wisdom of borrowing such ______ money.
A. a lots of B. a large sum of
C. a large number of D. a great many of
题二：
A number of students ______ playing on the ground but I don't k now what the exact number______.
A. are; is B. are; are C. is; is D. is; are
题三：
It was long _____ they found their son.
A. when B. since C. before D. that
题四：
It will be half a year ______ I come back.
A. before B. since C. when D. that
题五：
It has been ten years ______ he left Beijing.
A. before B. till C. since D. after
