问题补充：
But for water，it possible to live in the desert．
A. is
B. was
C. were
D. wouldn be
答案：
A. is
B. was
C. were
(答案→)D. wouldn be
解析：考查含蓄虚拟条件句：用without(＝but for),otherwise代替if从句。这里的but for water=if it were not for water要是没有水，主句是would do，句意：要是没有水，在沙漠里生活是不可能的。选D。
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