use
used
had used
has been using
第1题:
His sister left home in 1998, and _______since.
A. has not been heard of B. has not been heard of
C. had not heard of D. has not heard of
第2题:
A.can use
B. can be used
C.is to use
D. is using
第3题:
A.has been used
B.being used
C.has used
D.used
第4题:
A.red
B.brown
C.white
D.black
第5题:
Since 1780, when the town’s first hat factory ______ in Danbury, Connecticut, the town has been a center for hat manufacturing in the United States.
A、were established
B、was establishing
C、had been established
D、was established
第6题:
A、has employed
B、was unemployed
C、had been unemployed
D、has been unemployed
第7题:
A.use
B. used
C.have used
D. am using
第8题:
A. did use
B.was used
C. used
D. would use
第9题:
第10题:
Silk( )by Chinese for thousands of years now.
A. has used
B. has been used
C. was used
D. is used