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. it was already dark
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I wish I (can) (fly to) the moon (by) spaceship (one day).
A. can
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(How) can I convince you (of that) we have almost (used) up our (supplies)
A. How
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