The gas leak was serious enough ____the police to evacuate the bu_英语解答

The gas leak was serious enough ____the police to evacuate the building
1 because 2 why 3 for 4 since 5 to

人气：227 ℃　时间：2020-05-10 13:49:49

解答

我认为应该选for.
sth be adj.+ enough for sb to do有“对某人来说,某事足以...地做”的意思.