But for water，it ______ possible to live in the desert．
A．is　　　　 B．wasC．wereD．wouldn't be
D

試題分析：考查含蓄虛擬條件句：用without(＝but for),otherwise代替if從句。這里的but for water="if" it were not for water要是沒有水，主句是would do，句意：要是沒有水，在沙漠里生活是不可能的。選D。
點(diǎn)評：有時(shí)，句子沒有直接給出假設(shè)情況的條件，而須通過上下文或其他方式來判斷。這題用了Otherwise代替if的虛擬語氣，主句是1、表示與現(xiàn) 在事實(shí)相反的情況，主語+should/would/could/might+do：　2、表示與過去事實(shí)相反的情況，主句：主語+should/would/could/might+have done　3、表示對將來情況的主觀推測，主句：主語+should/would/could/might+do　
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