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did I didn’t I must I mustn’t I
must have forgotten must have left must forget must leave
man answered, but I didn’t recognize the voicE. --Oh，it____ my unclE. He was in my room then. A. should have been should be must have bee must be
cut it off cut it up cut it down cut it out
Can; have to Must; can Can; can Might; must
must drop must have dropped must be dropping must have been dropped
Must; can May; must Must; must May; may
lost missed left forgotten
must；must had to；have to had to； must have to；must
man answered, but I didn’t recognize the voicE. --- Oh, it ____ my unclE. He was in my room then. A. must have been should have been must be should be
man answered, but I didn’t recognize the voicE.--Oh，it____ my unclE. He was in my room then. A. should have been should be must have been must be
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