it seemed water is becoming less and less 为什么不在seemed后加that

it seemed water is becoming less and less 为什么不在seemed后加that
it seemed water is becoming less and less 为什么不在seemed后加that

it seemed water is becoming less and less 为什么不在seemed后加that
其实是有that的,只不过这个句子省略了.
it seemed (that) water is becoming less and less.

也就是说,有that无that都算正确.