—Is everything going all right?—Well,--------.A．not so smoot

—Is everything going all right?—Well,________.A．not so smooth as expected B．not so smooth—Is everything going all right?—Well,________.A．not so smooth as expected B．not so smooth as expectingC．not so smoothly as expecting D．not so smoothly as expected为什么C不行?expected 是指被动吗?还有 省略主语用doing是什么？是不是是主动的时候才省略主语用doing not so smoothly as was expected行吗，还是要么补全主谓 要么全部主谓省略？