A、 since
B、 when
C、 as
D、 while
答案:D
A、 since
B、 when
C、 as
D、 while
答案:D
A. explain
B. explains
C. toexplain
D. explaining
A. whichever
B. however
C. whatever
D. whoever
A. On
B. For
C. By
D. With
A. when
B. who
C. why
D. what
A. the best
B. better
C. the better
D. much better
A. but
B. for
C. since
D. or
A. there
B. here
C. where
D. now
A. the best
B. better
C. the better
D. much better