Most parents encourage their children to take an active part in social events, ()those events do not interfere with their studies.
A.so that
B.lest
C.unless
D.provided
正确答案:provided
Most parents encourage their children to take an active part in social events, ()those events do not interfere with their studies.
A.so that
B.lest
C.unless
D.provided
正确答案:provided