单项选择题

So far we have done a lot to build a low-carbon economy, but it is （）ideal. We have to work still harder．

A．next to
B．far from
C．out of
D．due to

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单项选择题

David is good （）English，but he doesn't do well （）PE．

A. at; on
B. at; in
C. at; with
D. in; at

单项选择题

— Peter, where did you guys go for the summer vacation— We （）working for months，so we went to the beach to relax ourselves．

A．were
B．have been
C．had been
D．will be

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