单项选择题

You should keep the milk in the ice box, ______ it will go bad.

[A] so
[B] but
[C] and
[D] or
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单项选择题
Since the middle of this century ______ has been learned about space than in all human history before that time.
[A] much
[B] more
[C] better
[D] a lot
单项选择题
If it rains, we should not go out, but the sky ______ perfectly clear.
[A] is
[B] will be
[C] was
[D] had been
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