单项选择题

I would (have come) to see you (had it been) possible, but I (had been) so busy (then).

A.have come
B.had it been
C.had been
D.then
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单项选择题
He pointed out that a (considerable) gap (existing) between the number of hours people (are paid) for working and the number of hours (spent) in productive labor.
A.considerable
B.existing
C.are paid
D.spent
单项选择题
We are (at) a critical point in our nation's history and we cannot go back as individuals or (as a country) to (what) .we were ten, five or even one year (earlier).
A.at
B.as a country
C.what
D.earlier
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