问题:
It was only after World War II had drawn to a close ______ in the United States.
A.did the baby boom begin
B.that the baby boom began
C.when the baby boom began
D.then the baby boom began
It was only after World War II had drawn to a close ______ in the United States.
A.did the baby boom begin | B.that the baby boom began |
C.when the baby boom began | D.then the baby boom began |
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