Catherine said that she ___ to Guangzhou.
A. has never gone
B. had never gone
C. has never been
D. had never been
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She asked Linda if___ go and get some.
A. could she
B. she could
C. she can
D. she may
Linda said the moon___ round the earth.
A. travelled
B. has travelled
C. travells
D. had travelled
I don't know ___ they have passed the exam.
A. what
B. if
C. when
D. where
I hardly understand.___ he has told me.
A. that
B. what
C. which
D. who