[ Mixed General Quiz ]
From the 9th century Ukraine was a part of Kievan Rus, the first significant East Slavic state which ___ to the Mongol invasions of the 13th century.
a. is succumbed
b. has succumbed
c. succumbed
d. succumbs

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I saw an old lady at the store who needed help. There was no one around so I helped ____ old lady.
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A. efface
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He told us he ………………………….. a big tiger.
A. have seen
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