--Haven't you seen Mr. Wilson at the lecture? --Yes, but he had left _________ I could ask him any questions.
#31720
A
when
B
before
C
after
D
as
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It is uncertain side effect the medicine will bring about , though about one thousand patients have taken it.
#30966
A
that
B
whether
C
what
D
how
You can’t appreciate happiness _______ you have known sadness too.
#32333
A
because
B
when
C
though
D
unless
Science has given clear evidence ______ smoking can lead to many diseases.
#31076
A
what
B
which
C
that
D
where
(2010·重庆)Today，we will begin ________ we stopped yesterday so that no point will be left out.
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A
when
B
where
C
how
D
what