—Why is that boy running so fast? —He _ . [ ]

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—Why is that boy running so fast?
—He _        .              [     ]
A. could be exercising
B. might be catch the bus
C. must chasing

答案

举一反三

—Do you think who can get the first prize in your class?
—It _     _ my best friend Dave.  He works hard and is a top student.             [     ]
A. must be
B. must belong to
C. used to be

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—What are those people doing in our school?
—I think they _        movies, because some of them are famous movie stars.              [     ]
A. must be making
B. must be watch
C. can"t be making

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—Whose guitar is this?
—It _     _ Alice.  Only she can play the guitar in our class.              [     ]
A. must be
B. must belong to
C. can belong

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—Where is your PE teacher?
—Look! Our PE teacher is swimming. He            swimming for exercise.             [     ]
A. can"t be
B. might
C. must be

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The computer doesn"t work.  I"m afraid you       use it today.      [     ]
A. may
B. can"t
C. can
D. mustn"t

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