—The light___________on for long. —Oh, I am sorry , I will go and turn it off.
#101529
A
has been left
B
has left
C
had been left
D
had left
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----Ten dollars, please!----How terrible! I ______ to bring my wallet with me.
#103730
A
was forgetting
B
forget
C
had forgotten
D
forgot
---John, why are you so upset? ---I­­­      my cell phone all morning but it is nowhere to be found.
#101303
A
am looking for
B
have looked for
C
have been looking for
D
had looked for
 With the help of high technology, more and more new substances ______ in the past years.
#104082
A
discovered
B
have discovered
C
had been discovered
D
have been discovered