___ many times, the boy still didn't know how to do the exercises
A . Having taught
B . Having been taught
C . taught
D . Teaching
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Some of the hotels in my hometown_________.
A . have now been rebuilding
B . are now rebuilding
C . are now being rebuilt
D . are rebuilt now
--- What do you think of the book? ---Oh, excellent. It's worth ___ a second time.
A . to read
B . to be read
C . reading
D . being read
This page needed ___ again.
A . being checked
B . checked
C . to check
D . to be checked
He_______by his teacher.
A . happened to see
B . was happened to see
C . happened to be seen
D . was happened to be seen