async function t(){ var a = new Promise( function (resolve, reject) { console.log(1); resolve(9); console.log(2); }) var b = new Promise( function (resolve, reject) { console.log(3); resolve(8); console.log(4); }) console.log(5); b=await b; a=await a; console.log(b); console.log(a); console.log(6);}t();console.log(7);//代码打印结果是什么？（）

A.1 2 3 4 5 7 8 6 9
B.1 2 3 4 5 7 8 9 6 
C.1 2 3 5 4 7 8 9 6
D.1 2 3 4 5 6 7 8 9
E.9 8 7 6 5 4 3 2 1