If there were no air or water, there______no living things on the earth.

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问题 If there were no air or water, there______no living things on the earth.

选项 A、can be
B、must be
C、may be
D、would be

答案D

解析 句意:如果没有水和空气,地球上就不会有生物。表示与现在事实相反的条件状语从句中,从句的表现形式为:If+主语+过去时(be动词用were);主句的表现形式为:主语+should/would/might/could+do。所以本题的答案选D。
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