Taking a trip abroad is certainly good for old couples, but it remains ____ whether they will enjoy it.
#91808
A
to see
B
to be seeing
C
to have seen
D
to be seen
推荐题目
The teacher said he needed _____ boys besides his students _____ the classroom. 
#97946
A
20 other; clean  
B
20 more; to clean
C
20 more; cleaning
D
another 20; clean
He is said _______ his novel a year ago, but I don’t know why it hasn’t come out.
#94425
A
to finish
B
to have finished
C
to be finished
D
to have been finished