_______ in the 1800s and first mass-produced in Germany, the harmonica(口琴) was designed to play simple folk tunes.
#96728
A
Being invented
B
Inventing
C
Invented
D
Having invented
推荐题目
Your cousin is said ________ a new computer program recently, but do you know when he will finish it?
#88521
A
to design
B
designing
C
to have been designing
D
to have designed
Ideally in the heart of the city, the hotel is a favourite with many guests.
#94403
A
locating
B
being located
C
having been located
D
located
.How many of us ____ a meeting that has nothing to do with us is not important at all.
#90626
A
attending
B
to attend
C
have attended
D
attend