-Are they about to have breakfast?
-Yes.it _______in the dining room.
| A．is being served |
| B．is Served |
| C．is serving |
| D．serves |
26．The researehers delermine what type of plants the virus can infect(感染) and____insects can carry the virus.
| A．those | B．why | C．which | D．How |
25．—Did you get my letter?
—I received one just as I____.
| A．set out | B．had set out | C．was setting out | D．would set out |
24．When she called at his studio, she____that he had gone to Japan.
| A．is told | B．was told | C．tells | D．Told |
23．Robert made a call to his parents yesterday afternoon. To his disappointment, ____of them answered it.
| A．either | B．both | C．none | D．Neither |
22．I_____stop by sometime and thank her for all her help.
| A．must | B．would | C．could | D．May |