It was not until she returned home_____she realized she had almost wasted ten of her valuable hours.
A．and
B．when
C．then
D．that

A.
A．and
B．when
C．then
D．that


【参考答案】

D
解析：考查的语法知识点是强调句型It is that。句意是：直到她回到家，她才意识到她浪费了10个小时的宝......

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