2. 外语
  3. It is essential that we ______ measures to protect the ozone layer.

It is essential that we ______ measures to protect the ozone layer.

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问题 It is essential that we ______ measures to protect the ozone layer.
选项 A、will take
B、should take
C、would take
D、took
答案B
解析 在“It is/was+某些形容词”后的that从句中，常用“ (should)=+动词原形”构成虚拟语气,表示建议、命令、要求、惊奇等。这些形容词包括:important,necessary,essential,natural,strange,advisable,desirable,probable,amazing,surprising,desired,suggested,required,proposed,decided等,故选B。
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