We should try all means to ensure ourselves_____ all possible risks.
A．thatB．a(chǎn)gainstC．forD．to
B
考查介詞：ensure sb against確保某人免受…,句意是：我們應(yīng)該用各種方法確保我們免受各種可能的危險(xiǎn)。選B。
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