2. 外语
  3. In some countries, there is very【16】rain at any time. The farmers there【17】irrigate (灌溉) their fields. Irrigation is【18】if there

In some countries, there is very【16】rain at any time. The farmers there【17】irrigate (灌溉) their fields. Irrigation is【18】if there

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问题     In some countries, there is very【16】rain at any time. The farmers there【17】irrigate (灌溉) their fields. Irrigation is【18】if there is a big river【19】the crops, and【20】there is plenty of water in it. Canals (沟渠)【21】the river water to the fields when necessary. In some seasons【22】may be too much water in the river, and the【23】may flood all the land near the river.【24】other times the river water may not be enough for all the farmers, and then it will be【25】to irrigate the fields.  
选项 A、because
B、if
C、since
答案B
解析 and是并列连词，连接两个由if连接的条件状语从句。
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