英语翻译
中文：口腔科WI-FI网络讯号已覆盖此处.
英文翻译是要使用 过去完成时 还是 现在完成时
e.g.在两种时态中亦不明白表达是否正确
1.过去完成时：a) Dental WIFI Network signal has been covered in this place.
b) Dental WIFI Network signal had been covered in this place.
c) Dental WIFI Network signal has been covered this place.
d) Dental WIFI Network signal had been covered this place.
2.现在完成时：a) Dental WIFI Network signal has covered this place.
以上两种时态是要使用哪一种比较自然,若以上都不太正确可以写出阁下的翻译.