The noun "educator" is needed to modify the adjective " a leading African-American."
A time preposition is needed here. Although all the choices deal with time, only "during" is the correct answer; it emphasizes a point in time.
"Once" is used in an adverb clause to show time relationship. The meaning of "once" is similar to "when."
This question is based on the correct word order. Only (B) has the right order.
"Because of "is a preposition that is followed by a noun object; it is used to show a reason.
it should be 'used'
it should be 'makes for'
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TOEFL Practice Test #9