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

試題分析：考查時態(tài)和主謂一致。句子的主語是when and where指一件事情的兩個方面，仍然使用單數(shù)形式。句意：James教授將會給我做一個關(guān)于西方文化的演講，單數(shù)何時何地還沒有確定。根據(jù)yet說明使用現(xiàn)在完成時。故A正確。
點(diǎn)評：當(dāng)when and where做句子的主語時，謂語動詞用單數(shù)的形式。
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