19．I don't know if you noticed their absence or not，but I _____________．（　�。�
A．doB．haveC．hadD．did

分析 我不知道你是否注意到了他們的缺席，但我注意到了．

解答 答案是D
根據(jù)句意，空格中要填的詞指代 noticed their absence or not，根據(jù)時態(tài)一致用do的過去式I did指代I noticed their absence or not．

點評 本題考查過去時，做這個題時要先確定所需要填的部分指代的內(nèi)容，然后根據(jù)句意確定單詞和時態(tài)．

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