单项选择题

It is strange that Mr. Green () attend the meeting.

A．should have failed to
B．failed to
C．having failed
D．has failed

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I decided to stop and have a rest, () I was feeling very tired.

A．moreover
B．whereas
C．so
D．for
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The old man and his dog were () to each other.

A．helped
B．attached
C．formed
D．engaged
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