Tenses/Passive/Indirect

When I last talked to him, he ______ English.                                A) studies  B) study  C) was studying    D) studied

I met her at yesterday’s party, but I ______ her by sight for years before that.                            A) had known B) have known C) will have known D) had been known

By 2030, scientists surely ______ a cure for cancer.                 A) are discovering B) have been discovered C) will have discovered D) had discovered

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