单项选择题

(It was) (in the) primary school (where) my teacher introduced (me to) computers.

A. It was
B. in the
C. where
D. me
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I can' t tell the ______ difference between the twin sisters.
A. slight
B. simple
C. slender
D. single
单项选择题
Shortly after the accident, two ______ policemen came to the spot.
A. dozen of
B. dozens
C. dozen
D. dozens of
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