单项选择题

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

A. so long as    
B. on condition that 
C. unless      
D. otherwise

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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
单项选择题
()you didn’t know the rules won’t be a sufficient excuse for your failure to report.

A. What
B. How
C. Because
D. That
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