—When did Bob leave?—I have no idea. I ________ a shower upstairs.
#99457
A
took
B
have taken
C
was taking
D
would take
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With the help of high technology, more and more new substances ___in the past few years.
#101737
A
discovered
B
have discovered
C
had been discovered
D
have been discovered
Many tall buildings _______ in Shengsi in the past few years.
#103407
A
has been built
B
have been built
C
were built
D
have built