Madame Curie is believed _______ radium.
#96123
A
discovering
B
having discovered
C
to have discovered
D
to discover
推荐题目
We all feel it is you as well as your wife that ________ for your son’s bad performance at school.
#95301
A
are to blame
B
is to blame
C
are to be blamed
D
is to be blamed
 ---The last one __________________ pays the meal.   ---Agreed!
#97896
A
arrived
B
arrives
C
to arrive
D
arriving