题目内容

By the end of this year Mr. Smith_______in our company for exactly three years.

A. is working
B. has worked
C. will work
D. will have work

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l think that the Great Wall is worthhundreds of miles to visit.

A. to travel
B. traveling
C. traveled
D. travel

The new staff didn't know how to use the system ________l explained it to him yesterday.

A. until
B. because
C. if
D. since

The first question we now discuss is _______ we should go there early tomorrow.

A. whether
B. where
C. what
D. whom

The auto industry spends large amounts of money on marketing compaigns young adult customers.

A. attract
B. attracted
C. to atrract
D. attracts

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