单项选择题

We were told that we could not swim until ______ came in because the sea was too far out.

A．Water
B．current
C．flood
D．tide
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单项选择题
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
单项选择题
Sick ______ she was, she has to prepare food for the whole family.
A．although
B．as
C．because
D．for
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