(2013·济南一模)—Can you keep the secret?
—You worry — I'm not going to mention it to anyone.
A. needn't
B. couldn't
C. mustn't
D. won't
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(答案→)A. needn't
B. couldn't
C. mustn't
D. won't
解析：选A 考查情态动词。句意：“你能保守这个秘密吗？”“你不必担心，我不会向任何人提及它的。”根据句意可知应选needn't，表示“不必”。