单项选择题

I felt somewhat disappointed and was about to leave ______ something occurred which attracted my attention.

A．unless
B．until
C．when
D．while
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单项选择题
Only by shouting at tile top of his voice ______.
A．was he able to make himself hear
B．he was able to make himself hear
C．he was able to make himself heard
D．was he able to make himself heard
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