Experiments of this kind ____in both the U．S．and Europe well before the Second World War．（　　）

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

【答案】D

【解答】

【點評】

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相關試卷

A．had consumed	B．was consumed
C．had been consumed	D．consumed

A．has left	B．had left
C．has been left	D．had been left

1．By the time I got to the party，the fruit and cakes ________.（ ）