A、can't she
B、can she
C、does she
第1题:
A.can't
B.mustn't
C.can'thavegone
D.mustn'thavegone
第2题:
You __________ her in her office last Friday; she’s been out of town for two weeks.
A) needn’t have seen B) must have seen
C) might have seen D) can’t have seen
选D
你上周五不可能在她办公室看到她了,她出城已经有两个星期了。 这里can表可能性
第3题:
Hardly()home when it began to rain.
Ahad I got
BI had got
Chad Iarrived in
第4题:
A.must
B.may
C.should
D.can
第5题:
A.Wait-to-Restore,ForcedSwitch,ManualSwitch,LockoutofProtection
B.ManualSwitch,Wait-to-Restore,LockoutofProtection,ForcedSwitch
C.LockoutofProtection,ForcedSwitch,ManualSwitch,Wait-to-Restore
D.LockoutofProtection,ManualSwitch,ForcedSwitch,Wait-to-Restore
E.Wait-to-Restore,ManualSwitch,ForcedSwitch,LockoutofProtection
F.Wait-to-Restore,ManualSwitch,LockoutofProtection,ForcedSwitch
第6题:
在生产者/消费者问题中,用s表示互斥信号量,e表示空缓冲区资源信号量,n表示满缓冲区资源信号量,下列生产者和消费者的操作(生产者和消费者可并发执行),可能产生死锁的是()。
A.生产者:wait(s); wait(e); append(); signal(n); signal(s);消费者: wait(s); wait(n); take(); signal(e); signal(s);
B.生产者:wait(s); wait(e); append(); signal(n); signal(s);消费者: wait(n); wait(s); take(); signal(s); signal(e);
C.生产者:wait(e); wait(s); append(); signal(s); signal(n);消费者: wait(s); wait(n); take(); signal(e); signal(s);
D.生产者:wait(e); wait(s); append(); signal(s); signal(n);消费者: wait(n); wait(s); take(); signal(s); signa