It is said that potato chips ____________ by mistake about a hundred years ago.
#41556
A
invent
B
invented
C
are invented
D
were invented
推荐题目
Sam came to Baihai in 2002. He __________ here for nine years.
#42228
A
lives
B
was living
C
has lived
D
will live
Mr. Smith came to our school in 2003. He _____ here for 10 years.
#36225
A
works
B
worked
C
will work
D
has worked
All the information except these two pieces _____ writing the article.
#42014
A
have been used to
B
has been used to
C
have been used for
D
has been used for
When ___you _____ your breakfast this morning? At 6.00.
#41854
A
have, had
B
did, have
C
are, have
D
has, had