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Professor James will give us a lecture on the Western culture, but when and where __________ yet.
A．hasn’t been decidedB．haven’t decided
C．isn’t being decidedD．a(chǎn)ren’t decided
A

A。根據(jù)句意，此處應(yīng)用被動語態(tài)，不用主動語態(tài); 再根據(jù)句末的yet可知，最好用現(xiàn)在完成時。故選A最佳。
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