The light bulb ______ by Edison in the middle of the 1780s.
#44649
A
is invented
B
was invented
C
invented
D
invent
推荐题目
Trees ________ every year to make our city greener.
#44941
A
plant
B
are planted
C
were planted
D
will be planted
All the information _____ writing the report.
#44725
A
is used for
B
is used to
C
is used as
D
is used by
–Smoking should in school.--I agree. It’s bad for our health.
#44372
A
be allowed
B
not allow
C
allow
D
not be allowed