专四
A． to run
B． running
C． runs
D． run
非谓语动词题。在连词but之前如果有动词do，其后的不定式就不用to，有一个很简单的原则：有do无to，有to无do，即前面有do的时候，后面就不用加to，若没有就要加上to。例如：Ihad nothing to do but sleep all the time．(有do无to)I had nothing to deal with but to readthe newspaper．(没有do要加to)。因此[D]正确。
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