单项选择题

They are teachers and don’t realize()to start and run a company.

A. what takes it
B. what it takes
C. what they take
D. what takes them

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Your cough will get worse ()you give up smoking.

A. so long as    
B. on condition that 
C. unless      
D. otherwise
单项选择题
It is vital that enough money () to fund the project.

A. be collected
B. must be collected
C. is collected
D. can be collected
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