短语 a waste of time 后加的是 to do还是 doing?

如题所述

第1个回答  2014-02-19
doing sth
例如: It is a waste of time working on this problem.
类似的句型有It's no use /no good/ a waste of time doing sth
第2个回答  2014-02-19
a waste of time to do sth.
第3个回答  2014-02-19
to do
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