肺结核阳性是什么意思:It must be morning now because the birds are singing.表述最佳吗？

It must be morning now because the birds are singing.表述最佳吗？ Wow,roast chicken,it must be d___. A foreeigh language can not be taught ,it must be learnt. what must be must be!什么意思！ Something must be done about it.必须得想个办法。 I can't open the lock. There must be ___ key taht will open it. ( )18. A: The computer must be looked after well when it ______. 【i feel ____,it must be something i ate.A ill Bsick 】 must be是什么意思 can be,may be和must be