.
—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
相关试题
Could I use your mobile phone now?
— Yes, of course you 
.
| A．can | B．could | C．were able to | D．might |
The millionaire passed away, leaving his children with a large ________．
| A．fortune | B．luck | C．money | D．amount |
– What shall we have for dinner tonight?
– Oh, I don’t care．________ will do．
| A．Anything | B．Everything | C．Something | D．Nothing |
What the children in the poor mountain village need ________ textbooks．
| A．is | B．are | C．has | D．have |
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