—Ididnotknowyouweregoodfriends

—I did not know you were good friends.
—You__________. I have known her since she moved here. You were abroad then.

A．may have

B．needn’t have

C．couldn’t have

D．must have

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Most online classes let students learn _____ their own pace.

A．at

B．to

C．from

D．by

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_____the size of the universe, some researchers believe that there is life beyond our planet.

A．Consider	B．To consider
C．Considered	D．Considering

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The trains leave every 15 minutes; if you miss ____ , you don’t have to wait long for another.

A．it

B．this

C．one

D．some

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Mr. Sawyer started his career at Stanford University, _____ he became Professor of Physics in 2002.

A．which

B．where

C．when

D．that

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–Peter, do you know how to download the new software?
–Certainly. I _____ you the steps.

A．show	B．am showing
C．will show	D．have shown

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