问题
选择题
—Can you keep a secret?
—You ________ worry—I'm not going to mention it to anyone.
A．needn't
B．couldn't
C．mustn't
D．won't
答案
答案：A
答案：A 考查情态动词。句意为：你能帮我保守秘密吗？你不必担心，我不会向任何人提及的。needn't不必要；couldn't不能够；mustn't禁止；won't将不会。根据句意可知，答案A符合语境。