With the help of high technology, more and more new substances ______ in the past 10 years.
#71929
A
discovered
B
have discovered
C
had been discovered
D
have been discovered
推荐题目
In summer there is________swimming as a means of keeping fit.
#64135
A
nothing like
B
something like
C
anything like
D
nothing but
Rather than ___ on a crowded bus, Tom always prefers __ a bicycle.
#65242
A
ride; ride
B
riding; ride
C
ride; to ride
D
to ride; riding