单项选择题

Nowadays, books are expensive. Every time I go to the bookstore, I seem ______ more.

A．to be spending
B．spending
C．to spending
D．spend
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单项选择题
It was when he began to make the new experiment in 1908 ______ such an ambitious plan.
A．had he
B．did he have
C．that did he have
D．that he had
单项选择题
It is unusual for there ______ so many tourists on the beach at this time of the year.
A．be
B．were
C．being
D．to be
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