Do not walk on those stones lest you ______ trip and fall.
A
will
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B
might
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C
can
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D
should
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Solution
The correct option is B should 'Lest' is defined as something done in order to avoid an undesirable consequence. Lest is always followed by subjunctive mood, usually in either the present or future tense. The future subjunctive would employ the auxiliary word 'should'. Thus, according to the usage rules, option D is the correct answer.