grammar - Taiwanese English Questions for Native Speakers

These question are from a Taiwanese GEPT exam at the intermediate level(senior high school English). I grew up in New Zealand, so I think I am partially a native speaker. But, I got both of these questions wrong. My answers were: 1.B 2.A. I picked these answers just because they sound better and more fluent. Please try these questions and let me know what you think. The correct answers are listed on the bottom.

1. The chairman proposed that the meeting ______until next Friday because a typhoon was approaching.
   A. must put off
   B. must be put off
   C. put off
   D. be put off




2. Over the past 40 years, Mr Wilson has taught thousands of students, some of them ____________internationally known scholars.
   A.have become
   B.had become
   C.having become
   D.may have become

correct answers
1.d 2.c