单项选择题

At that time, many readers (found) (it) difficult (believing) what Jules Verne had written in his book (to be) tree.

A．found
B．it
C．believing
D．to be
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单项选择题
(Two-thirds) of (the) area (are) covered by (water).
A．Two-thirds
B．the
C．are
D．water
单项选择题
He (was) (lying) (on) the couch, (enjoyed) his cigar.
A．was
B．lying
C．on
D．enjoyed
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