【单选题】桩核冠修复中,对于所修复残冠的错误处理为
【单选题】桩核冠修复中, 对所修复残冠的错误处理是
【单选题】When he lived in that remote place, radio was the only means be had to keep ______ of current events in the country.
【单选题】When he lived in that remote place, radio was the only means he had to keep ______ of current events in the country.