17．-What if he failed in the next monthly examination again？
-I don't know．______ heart and be reduced _____ the class？（　�。�
A．Will he lose； not to attending
B．Did he lose； to not attending
C．Had he lost； not to attending
D．Would he lose； to not attending

分析 --如果他再次在月考中失敗怎么辦？
--我不知道，他會灰心而淪落為不上學(xué)了嗎？

解答 答案：D．
第一句話的if he failed in the next monthly examination again？是對將來的虛擬條件句，下文是對將來虛擬的主句，用would do，第二空be reduced to doing"淪落為做…"，to是介詞，后面接動名詞，not放在動名詞前面，所以選D．

點評 將來的虛擬條件句表示與將來事實相反：
從句：Were to/should+動詞原形   主句：Would/could/should/might+動詞原形

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