It is said that potato chips ____________ by mistake about a hundred years ago.
#41556
A
invent
B
invented
C
are invented
D
were invented
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I don’t know when my son back, but when he back, I’ll call you.
#36254
A
comes；comes
B
will come；will come
C
comes；will come
D
will come；comes
—Oh, Mrs. Liu, your necklace looks nice. Is it new? — No, I ____ it for two years.
#39277
A
had
B
have had
C
bought
D
have bought
—Hello, may I speak to Mr Green , please?—Sorry. He ________ a meeting. Can you call him later?
#39035
A
has
B
is having
C
will have
D
had