【单选题】
A <{p}><{font _mstmutation="1" _msttexthash="42250" _msthash="6762"}>CLEAR<{/font}><{br/}><{/p}>
B <{p _msttexthash="2501863" _msthash="6763"}><{font _mstmutation="1" _msttexthash="34762" _msthash="6765"}>STEP<{/font}><{br/}><{/p}>
C <{p _msttexthash="1900899" _msthash="6766"}><{font _mstmutation="1" _msttexthash="45773" _msthash="6768"}>WRITE<{/font}><{br/}><{/p}>
D <{p _msttexthash="47112" _msthash="6769"}>INSTR<{/p}>
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