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—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 instructedB.must have instructed
C.must be instructing D.will be instructing
C               
             
试题分析:考查情态动词。句意:杰克刚才不在办公室。他肯定正在指导那些一个小时内要驾照考试的学员。 根据上文提到Jack is not in the office at the moment 他刚才不在,故表肯定推测,推测刚才正在做某事must be doing,所以选C项。        
考点 : 考查情态动词
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