_____ you return those books to the library immediately, you will have to pay a fine.
选项:
A:Until ;
B:Unless;
C:If ;
D:Provided
发布时间:2024-05-13 08:28:56
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You do not need to give the return processes in its entirety unless you need to comprehend the system.
B:Unless you need to understand the system,fully show the return lines.
C:Return procedures need not be shown completely if you need to realize the system.