【单选题】( )方法允许一个且仅一个线程继续执行后面的语句。
【简答题】She said, "Mr.Liu has arrived in Beijing to attend a meeting." She said that Mr.Liu __________ in Beijing to attend a meeting.
【单选题】Enter方法允许一个且仅一个线程继续执行后面的语句;其他所有线程都将被阻止,直到执行语句的线程调用( )。
【单选题】–It’s said that Wang Meng spent almost 10 hours training every day. --That’s true. She is really hard-working. ______, she won 3 golden medals in the 21st Winter Olympics.
【单选题】取消键CAN的用途是消除输入( )中的文字或符号。