I _____ frustrated when I wasn"t sure of the correct answer. [ ]A. may be

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I _____ frustrated when I wasn"t sure of the correct answer. [ ]
A. may be
B. used to
C. used to be
D. use to be

答案

举一反三

—_____ you use to play football?
—Yes, you are right.[ ]
A. Are
B. Do
C. Did
D. Will

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She didn"t have a rest and ____. [ ]
A. continue working
B. go on working
C. went on to work
D. went on working

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A strange sound ______ yesterday evening.     [     ]
A. was heard
B. hears
C. heard
D. is heard

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A beautiful bike _______ him by his classmates.     [     ]
A. sent to
B. will sent to
C. was sent to
D. will be sent for

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We ____ here two hours ago . We ____ here for two hours .        [     ]
A. have arrived, have been
B. have come, have been
C. came, have come
D. arrived, have been

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