This is a very difficult operation. It is essential that you __________ for emergency. A、are to be prepared B、would prepared C、be prepared D、must be prepared

This is a very difficult operation. It is essential that you __________ for emergency.
A、are to be prepared
B、would prepared
C、be prepared
D、must be prepared

出自：合肥财经职业学院-工商企业管理

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