题目内容

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

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