[ Grammar ]
Choose the correct word or word pair that completes the sentence.
It _______________ been delayed in another city.
_____
A. must of
B. must have
Select your answer:
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Grammar and Sentence Structure › ViewIdentify the helping verb in the sentence: “The birds have been flying south for the winter.”
A. Have been
B. Flying
C. South
D. Winter
Grammar › View
Yesterday, I went to the post office. I went there to post ______ letter.
A. a
B. an
C. the
D. –