students of class 4 __ (plan)to go sightseeing next week

问题描述:

students of class 4 __ (plan)to go sightseeing next week

are planning
虽然class 4是单数,但是主语是students.所以副词要配合主语,选are planning.
当然,plan 也可以用,可是这道题考的应该是分清主语来选择副词,所以最佳选择是are planning的进行时.