[ Past Perfect Simple & Continuous ]
Which one is the correct formula for Past Perfect Simple?
A. Had + Past Participle
B. Had been + Verb (+ing)
C. Had + Verb (+ing)
Select your answer:
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A. have
B. has
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Select the correct auxiliary verb to complete the sentence: “They ______ been studying for hours.”
A. has
B. have
C. is
D. was