单项选择题

They have gone to Xi' an. ______ you ever _______ there before

A． Have... been
B． Have... gone
C． Do... go
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单项选择题
When the baby saw the stranger, he couldn't help ______.
A． cry
B． to cry
C． crying
单项选择题
Don't stop and go on ______.
A． read
B． to read
C． reading
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