问题
选择题
Most parents encourage their children to take an active part in social events, ______ those events do not interfere with their studies.
A．concerning
B．until
C．unless
D．provided
答案
答案：D
词义辨析题。A. concerning 关于 B. until 直到 C. unless 除非 D. provided 只要 大多数父母允许孩子参加参加社会活动只要这些活动不影响学习。 根据语境选D