单项选择题

I found the lecture hard to follow because it _________when I arrived.

A．started
B．was starting
C．would start
D．had started
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单项选择题
_________ the forest park is far away, a lot of tourists visit it every year.
A．As
B．When
C．Even though
D．In case
单项选择题
There are still many problems _________ before we are ready for a long stay on the Moon.
A．solving
B．solved
C．being solved
D．to be solved
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