The traffic was held up for more than thirty minutes, ________ caused me to arrive late.
D
非限制性定语从句引导词的选取。
Thechallengeisnotoneofexpansion._______,therapidgrowthinenrollmentoverthelast40yearshascometoanend.
Sofarscientistshaveonlyacquired________understandingofthephysicalprocessesthatcauseearthquakes.
Thewoundedsoldierswouldrecoverquicklyiftheywerewell________.