文法・語法的な事柄としては基礎ですが、文章の中にでてくると見抜けないことがあります。以下の文章は、学士編入試験の過去の問題、最新の医学雑誌記事からのものですが、ともに頻出です。
The military researchers contributed greatly to anthrax research, but the mechanism of the toxin wouldn't have been so quickly solved had university labs not gotten involved as well.
[The Best American Science Writing, 2003]
Some did have feelings of hopelessness characterized by an inability to envision a meaningful future given the limits imposed by their disease, but such feelings are often distinct from clinical depression.
(N EnglJ Med May 10, 2007)
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