（英语单选）After about thirty years of no

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（英语单选）After about thirty years of no
After about thirty years of no direct flights,_____ US passenger plane left San Francisco,California on Thursday for _____ Ho Chi Minh City,Viet Nam.
A.a;不填 B.the;不填 C.a;the D.the;the
说一下这些属于什么情况?
Are human beings _____ to fly to the sun in a spaceship?
A.probable B.likely C.possible Dimpossible
D应该可以排除,我选的B,讨论一下前三个?
He often wasted his time drawing some pictures when he _____ something that _____ him.
A.should be doing;has given
B.should have been doing;was given
C.should do;was given
D.should have been doing;had given
我认为第二个是was given,选了B,do,should be done,should have been doing都是表示什么啊?
自助者天助!

1.B 这个题是冠词的考点,a 是泛指,the是特指.第一个空是特指美国的客机,第二空是零冠词的考点,这个你只有去查书,每本语法都有讲那些是特殊的零冠词用法,其中就有地名前不用冠词.
2 B be likely to do sth.可以理解为一个句型来背,a 没有这种用法,c 是因为possible 修饰的不能是人,一般用it 形式主语的形式
3 B should have done 表示本应该某事而没有做,自然shuold have been doing表示本应该正在做某事,而没有做,是个虚拟语气.第二空是定语从句的考点,用was given表示被动.这个题翻译为当他本应该做自己手头工作的时候,他总是浪费时间在画画上.实际没有做自己手头工作,是一种抱怨的情绪.
should do 就是表示一般的应该做某事,i should go.
should be done 表示应该被做,your work should be done by 10'o'clock.
should have done 是虚拟,表示本应做而没有做.

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