The boy could ________ the street by himself.A.cross B.crossingc.crossesd.to cross

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Theboycould________thestreetbyhimself.A.crossB.crossingc.crossesd.tocrossTheboycould________thestree

The boy could ________ the street by himself.A.cross B.crossingc.crossesd.to cross
The boy could ________ the street by himself.
A.cross
B.crossing
c.crosses
d.to cross

The boy could ________ the street by himself.A.cross B.crossingc.crossesd.to cross
cross,could后面要跟正常形式.

选A。(could+动词原形)