单选题 We have to think very carefully before we take any action, because it's a very ______ situation we are in.
A. ideal B. favourable C. good D. severe

【正确答案】 D
【答案解析】severe意为“严重；苛刻”等。从上下文来看此词最合适。整个句子说的是：我们采取任何行动之前都必须非常仔细地考虑考虑，因为我们所处的情况非常严峻。