问题

w buyer identified a dozen new sources for thematerial, ___________ proved to be reliable
A:saw take
B:seen taking
C:seeing take
D:seen taken
B:seen taking
C:seeing take
D:seen taken
正确答案是:
同类题型
We thought he would have got the job.— What a pity! He ______too nervous when interviewed
His letter was so confusing that I couldhardly make any ______ of it
The number of the students in No.1 Middle School ________ than _______ in No.2 Middle School.
Where on earth have they gone?—I have no idea, but I wish I .