单项选择题
It ______ months since we ______ in Shanghai.
- A．has been; were
B．is; are
C．was; had been
D．had been; have been
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A．out
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C．about
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The movement of the moon conveniently provided the unit of month, which was ______ from one new moon to the next.
A．assessed
B．measured
C．reckoned
D．judged -
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Could you tell me ______ in the Russian alphabet
A．how many letters are
B．how many letters are there
C．how many there are letters
D．how many letters there are
