单项选择题

--Nice to see you. I ______ you for a long time. --I ______ in Berlin. I've just got back.

A．didn't see, am
B．wasn't seeing, am
C．hadn't see, have been
D．haven't seen, was
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单项选择题
It must have rained last night, ______ the ground is wet.
A．because
B．as
C．since
D．for
单项选择题
______ would you solve the problem if this method failed
A．What else
B．How else
C．How little
D．How else
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