Scientists ________ research in order to seek greater understanding of the brain，especially since the 1950s.（　?。?/h1>

A．conducted	B．have been conducted
C．have been conducting	D．had conducted

【答案】C

【解答】

【點評】

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Scientists ________ research in order to seek greater understanding of the brain，especially since the 1950s.（ ?。?/h1>