单项选择题

He went into the house without ().

A．asking
B．inviting
C．being invited
D．invitation

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单项选择题

()in the mountains for a week, the two students were finally saved by the local police.

A．Having lost
B．Lost
C．Being lost
D．Losing

单项选择题

You ought to do()your mother tells you.

A．when
B．while
C．as
D．that

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