He met Rachel at her college graduation ceremony in 2011, ________ he was later to marry.
#67273
A
which
B
when
C
where
D
whom
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The factory ______we'll visit next week is not far from here. 
#73828
A
where
B
to which
C
which
D
in which
 The question is too difficult and we found ________.
#66590
A
it not easy to answer it
B
it was not easy for us to answer it
C
it’s not easy to answer
D
it not easy to answer
 _______ in the regulations that you shouldn't tell other people the password of your e-mail account.
#72633
A
What is required
B
What requires
C
It is required
D
It requires