单项选择题

I didn't hear the phone, I ______ asleep.

[A] must be
[B] must have been
[C] should be
[D] should have been
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单项选择题
Please give me ______. I'm not tall enough to reach the book on the top of the bookshelf.
[A] a hand
[B] help
[C] hands
[D] helps
单项选择题
No one helped me. I did it all ______ myself.
[A] for
[B] from
[C] by
[D] to
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