单项选择题

He doesn't (say) in his letter (that) he's going to (be back) (or not).

A．say
B．that
C．be back
D．or not
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单项选择题
He went to the library (and) spent the whole afternoon there (to look) for (material) for an article (on) Shakespeare.
A．and
B．to look
C．material
D．on
单项选择题
In order to (attain) our objective, it is (essential) that we (will make) the best use of the limited resources (available).
A．attain
B．essential
C．will make
D．available
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