The samples must ____ at a low temperature until they are tested.
Answer and explanation
Correct answer: B. be stored
- Step 1: The samples receive the action, so the verb must be passive. Step 2. A passive after a modal is modal + be + past participle. Answer: be stored. Why not the others: 'store' is active; 'be storing' is a continuous active form; 'have stored' is a perfect active form.
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