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
Mr. Brown often (wore) a heavy coat because he was not (used to) (live) in such a (cold climate).
A. wore
B. used to
C. live
D. cold climate
单项选择题
(Those of us) who work in chemical (laboratories), should have (their) lungs (checked) quite regularly.
A. Those of us
B. laboratories
C. their
D. checked
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