Youcannotfindyourtickets.Ithink_________.
A. youhadleftthemonthetable
B. youleftthemontable
C. youdidleftthemonthetable
D. youleftthemonthetable
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Itisjustnineo’clock.Theplane__________fiveminutesago.
A. hasjusttakenoff
B. hasjusttookoff
C. justtookoff
D. justhastakenoff
—“Tomgraduatedfromcollegeataveryyoungage.”—“He________havebeenanoutstandingstudent.
A. must
B. could
C. should
D. might
George_____havemissedtheway,Iexplainedtheroutecarefullyanddrewhimamap.
A. mustn’t
B. isn'tableto
C. couldn't
D. maynot
Susan,you’resolazy.Thisjob_________hoursago.
A. shouldhavefinished
B. couldhavefinished
C. oughttohavebeenfinished
D. musthavefinished