—Jack is not in the office at the moment
—Oh, he those who are going to take the driving test in an hour.
A. can have instructed
B. must have instructed
C. must be instructing
D. will be instructing
网友回答
A. can have instructed
B. must have instructed
C. must be instructing
D. will be instructing
解析：可联系答.案.网客服索取。