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
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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
单项选择题
--I really hope your cousin Tim will get the job.--Thanks. I'll tell Tim when I ______ him.
[A] see
[B] will see
[C] would see
[D] have seen
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