单项选择题

Hardly (did he hear) his mother's (calling) (when) he realized that it (was already dark).（）

A．did he hear
B．calling
C．when
D．was already dark

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单项选择题
The reason (why) Jack (failed) to (attend) the lecture is (because) he had a bad cold.（）

A．why
B．failed
C．attend
D．because
单项选择题
(How) can I convince you (of that) we have almost (Used up) our (supplies)（）

A．How
B．of that
C．Used up
D．supplies
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