18．The baby is due in May．               the new house should be finished．（　�。�
A．by thenB．by whichC．by whenD．since when

分析 這個嬰兒預產(chǎn)期是5月份，到那時新房子應該完工了．

解答 答案：C．根據(jù)這個嬰兒預產(chǎn)期是5月份，再由后面the new house should be finished，說明先行詞 May在定語從句中做時間狀語，by不遲于，故選C．

點評 本題考查定語從句的連接詞，在充分分析句型基礎上以及熟知連接代詞，連接副詞的情況下便能選出正確答案．注意by不遲于

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