[ Perfect Tenses of Verbs ]
By that time, the dance troupe had mastered the routine for their recital.
A. present perfect
B. past perfect
C. future perfect

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Past Tenses › ViewShe was crying when I …………… her
A. was seeing
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______ in 1636, Harvard is one of the most famous universities in the United States.
A. Founding
B. Founded
C. It was founded
D. Being founded