向含0.2mol NaOH的溶液中通入一定量的H2S气体，充分反应后，将得到溶液小心减压蒸干，得固体7.9g，则该无水物一定含有的物质为
| A．Na2S和NaHS | B．Na2S和NaOH | C．NaHS | D．Na2S |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |