题目内容

Dear employees,Due to recent virus problems, the maintenance department uploaded anti-virus software program to our company intranet. If you think your computer has been infected, the only safe course of action is to install the new anti-virus program. In addition, the maintenance staff regular maintenance of all computers beginning 11 a.m. on Wednesday.The computers will be unavailable for one to three hours depending on their condition. the inspection and maintenance are completed, employees will be informed of the availability of the computers.Please contact the maintenance department with any questions and concerns about this matter. We apologize for any __ this may cause.

A. will be performing
B. had been performing
C. has been performed
D. was performing

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