单项选择题

Einstein's (relativity) theory is the (only one) (what) can explain such (phenomena).

A．relativity
B．only one
C．what
D．phenomena
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单项选择题
Smith sold (most of) his (belongings). He has hardly (nothing) left (in) the house.
A．most of
B．belongings
C．nothing
D．in
单项选择题
Riding on the swings (秋千) and (playing) with the ducks in the pond (was) our (children’s) greatest pleasure when we took (them) to the park.
A．playing
B．was
C．children's
D．them
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