单项选择题

You can go out, ______you promise to be back before 11 o'clock.

A. even though
B. ever since
C. as far as
D. as long is
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Seldom ______so warmly welcomed.
A. has he been
B. he has been
C. was he
D. he had been
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He is' only a boy of three, but he can learn the poem ______heart.
A. by
B. at
C. in
D. to
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