The bridge was built in memory of the adventurer who was believed ______ the valley.
#91202
A
to have been discovered
B
to discover
C
to have discovered
D
having been discovered
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 The dog, _____, will be made a good watchdog.
#98867
A
to train properly
B
being trained properly
C
properly to train
D
trained properly
 My son has gone abroad. I’m looking forward to him_______.
#90696
A
return
B
to return
C
returning
D
returned