(2013·东北三校4月联考)—Car prices have been going down sharply in the last 20 years.—It's not surprising because the law of market ________ the price of a product.
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A
is controlling
B
controls
C
has controlled
D
controlled
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----Ten dollars, please!----How terrible! I ______ to bring my wallet with me.
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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
—May I remind you that a Mr. Wang is waiting outside, sir?—Oh, that’s right. I about it.
#104848
A
forget
B
had forgotten
C
forgot
D
have forgotten
My parents have promised to come to see me before I _______ for Africa.
#104944
A
have left
B
leave
C
left
D
will leave
With the help of high technology, more and more new substances ______ in the past years.
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A
discovered
B
have discovered
C
had been discovered
D
have been discovered