First of all, the landlord asked this question, which shows that the landlord is very smart and knows how to use domestic credit cards abroad.

Secondly, all domestic banks don't have Singapore dollar foreign currency credit cards. Because the Singapore dollar is a small currency in China, and not every bank has a convertible stock. Therefore, it is impossible to have a dual-currency credit card with Singapore dollar as foreign currency

Finally, the first half of dragon_zhz's answer is wrong. Bank of China has dual-currency credit cards with yen and euro as foreign currency and RMB. Other banks are basically dual currency of USD+RMB.

To sum up, you can use domestic dual-currency cards for short-term travel in Singapore, but it is not worthwhile to live and work for a long time.