3. 如果你计划去海边玩儿，记得带上泳衣。 A: A. If you are planning to go to the seaside, remember to take the swimsuit. B: B. If you are planning to go to the seaside, remember taking the swimsuit. C: C. If you plan going to the seaside, remember to take the swimsuit. D: D. If you plan going to the seaside, remember taking the swimsuit.