Questão de Inglês — Verbos | Verbs — FUMARC 2011

Question 25: Choose the CORRECT alternative to answer question 10, according to TEXT 04.You leave the supermarket and go straight to Heathrow to meet an old friend of yours. But at the entrance, you find the above sign which means you _____ enter.

1. Ashould
2. Bmust
3. Cshouldn’t
4. Dmustn’t