单项选择题

The traffic was very heavy, ______, and so we arrived after the start of the program.

A．this was completely unexpected
B．which was completely unexpected
C．that was completely unexpected
D．it was completely unexpected
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单项选择题
Their proposal is better than ours, ______.
A．all things considering
B．all things considered
C．all things are considered
D．all considered things
单项选择题
Now that in scientific communities the use of computers is widespread, and supposing that there is sufficient time, there exist no complicated problem ______ can be addressed with some hope of resolution.
A．and
B．but
C．as
D．which
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