Any employee wishing to leave the workplace for any reason during business hours must ______a special leave form.

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问题 Any employee wishing to leave the workplace for any reason during business hours must ______a special leave form.

选项 A、sign
B、signs
C、to sign
D、was signed

答案A

解析 本题需选择适当的动词词形。情态动词must后接动词原形,故选(A)sign。
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