Theprofessorexplainedthistheor

The professor explained this theory so clearly that this phenomenon was easy enough ________.

A．for us to work out	B．working out
C．for working out	D．to working out

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I could just see a car in the distance, but I couldn’t _____ what color it was.

A．look out

B．get across

C．make out

D．take after

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What did you ____ me ____? I’m a teacher, not a doctor.

A．take; over

B．take; up

C．take; off

D．take; for

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The new discovery is of ________.

A．great significance	B．very significance
C．great significant	D．very importance

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Once _____ , the machine will keep running.

A．start

B．started

C．to start

D．starting

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____ in thought, he almost ran into the car in front him.

A．Losing

B．Having lost

C．Lost

D．To lose

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