题目内容

A．IfB．AlthoughC．Though

A. If
B. Although
C. Though

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A．inB．atC．on

A. in
B. at
C. on

A．thatB．whereC．which

A. that
B. where
C. which

A．ISDNB．OSIC．DDND．DSP

A. ISDN
B. OSI
C. DDN
DSP

A．atB．inC．after

A. at
B. in
C. after