Whilst more can (and should) be said on the matter, especially regarding why China did eventually get involved in the First World War, the short answer is: yes they did get involved. However, the Chinese did not send troops to fight in any of the fronts of the First World War, instead their main contribution (and a massive one it was) to the Allied war effort on the Western Front was the dispatching of the Chinese Labour Corps in 1917. I go into more depth in this past writeup so that might be of interest to OP and yourself fellow AH traveller!