单项选择题

Lesson Three is (the most) difficult lesson, (but) it isn’t (the) most difficult lesson (in) Book Four.

A．the most
B．but
C．the
D．in
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Two (woman) teachers and four (girl) students (were) praised (at) the meeting yesterday.
A．woman
B．girl
C．were
D．at
单项选择题
They (are going) to (have) the servicemen (installed) an electric fan (in) the office tomorrow.
A．are going
B．have
C．installed
D．in
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