Since it is ______ to ask for sick leave, he often uses it as an excuse for staying away from school.
A: objective
B: valid
C: productive
D: conventional
                    A: objective
B: valid
C: productive
D: conventional
举一反三
- Since it is _______ to ask for sick leave, he often uses it as an excuse for staying away from school.
 - Since it is () to ask for sick leave, he often uses it as an excuse for staying away from school. A: Invalid B: Effective C: valid D: Accessible
 - Since it is _________ to ask for sick leave, he often uses it as an excuse for staying away from school. A: legal B: good C: right D: valid
 - He had a speech to prepare, so he ____ the party at an early time. A: get away B: get away from C: leave for D: leave from
 - 我不得不请三天病假 A: I have to ask for a sick leave for three days. B: I have to ask for a leave for three days. C: I must ask for a sick leave for there days.
 
