标志着我国对外开放进入新阶段的重大举措是实施“走出去”战略
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She didn’t go to school yesterday, ______ he had hurt her legs while climbing the mountain.
A. but
B. however
C. or
D. for
Maybe he has gone home, ______ he is in his office.
A. or
B. but
C. nor
D. yet
The shop is new, _____ it has been open only for three days.
A. for
B. and
C. but
D. so
You needn’t sweep the floor, ______ it’s very clean.
A. and
B. but
C. or
D. for
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