She says that she'll have to close the restaurant ______ business improves.
句意：她说，除非生意好转，否则她将不得不关闭餐厅。
考查从属连词。if 如果；after 在……之后；unless 除非；when 当……时候。根据 business improves和she'll have to close the restaurant可知“生意好转”与“她将不得不关闭餐厅。”是条件关系，应是“除非”。故选C。
She says that she'll have to close the restaurant ______ business improves.
The boy is not very tall, _______ he runs very fast.
You will feel cold _______ you don't wear a coat.
In some cities of China, you'll get fined ________ you don't walk along the crosswalk while crossing the road.
Vivian will take her daughter to the amusement park________she gets the tickets．
Which club do you prefer to join，the chess club________the dancing club？
Love from parents is like the wind-you can’t see it you can feel it.
My parents gave red packets to my cousin every Spring Festival________ she got a job, because she said she was able to make money.
They didn’t go home ________ they finished their work.
—What do you feel ______ you are looking through the old pictures?
—How time flies!
