not until this term__to realize how important this subject is to his future career as a diplomatA.he beganB.did he beginC.has he begunD.thath he has begun选什么?为什么?答案是B为什么？

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not until this term__to realize how important this subject is to his future career as a diplomatA.he beganB.did he beginC.has he begunD.thath he has begun选什么?为什么?答案是B为什么？
not until this term__to realize how important this subject is to his future career as a diplomat
A.he began
B.did he begin
C.has he begun
D.thath he has begun
选什么?为什么?
答案是B为什么？

not until this term__to realize how important this subject is to his future career as a diplomatA.he beganB.did he beginC.has he begunD.thath he has begun选什么?为什么?答案是B为什么？
b
not...until 表示直到.才.
当把not until 置于句首时,要倒装
He didn't realize how important the subject is to his future career as a diplomat.
原来的时态应该是过去时,表示以前的一个动作或状态,不该用完成式,
此处的this subject is 可认为是常识,真理.没必要用过去式.

C not until是直到。。。才。。。的意思这句话的正常语序应该是He hasn't began to realize realize how important this subject is to his future career as a diplomat until this term.

until...和not until... not ...until not.until. Maybe i can not get the reply until/till this afternoon.Is this sentence right? i did not realize why this place was famous until icame here强调not Not until nine o'clock this morning_______ he get up.Not until nine o'clock this morning_______ he get up.A.do B.doseC.didD.has not until与not...until的差别 Not until he arrived home___ he find that this wallet had been stolen. Mike ___(believe,not)this until he___(see)it with his own eyes. You do not miss your water until dry.You always doing like this. not...until怎么倒装? 英语翻译加（not.until) not until用法 not until的用法 not until的用法! not.until 怎么造句? 用not...until造句 not until 翻译