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
I would like to buy the black pen because I ______that kind of pen ______well.
#39722
A
have told ;writes
B
was told;wrote
C
have been told;writes
D
have been told;is written
There is no doubt that students ________in their study if they       more praise from their teachers.
#36925
A
will make progress; will get
B
make progress; get
C
will make progress; get
D
make progress; will get