问题补充:
These flowers should not be watered too , once .
A. long; every other day
B. often; every fourth day
C. soon; every two days
D. frequently; each five days
答案:
A. long; every other day
(答案→)B. often; every fourth day
C. soon; every two days
D. frequently; each five days
解析: long长;soon 快;often经常;frequently频繁;every fourth day/every five days每5天,每隔4天。句意:这些花不能被经常浇水,每四天浇一次就行了。本题的一空不能使用long, soon与句意不配。故B正确。