问题
选择题
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
答案：B
题目分析： 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。