Not until he went abroad to further his study_______ the importance of English.

A．has he found

B． he has found

C．did he find

D． he had found

1970年8月12日，（） * * 访苏，正式签订了《莫斯科条约》。

A.阿登纳

B.谢德曼

C.台尔曼

D.勃兰特