The boys spent the whole morning _______ possible answers to the question.A.discussB.and discussing C.discussingD.and discussed 为何选 C,语法是怎样的呢?

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The boys spent the whole morning _______ possible answers to the question.A.discussB.and discussing C.discussingD.and discussed 为何选 C,语法是怎样的呢?

The boys spent the whole morning _______ possible answers to the question.A.discussB.and discussing C.discussingD.and discussed 为何选 C,语法是怎样的呢?
The boys spent the whole morning _______ possible answers to the question.A.discuss
B.and discussing
C.discussing
D.and discussed
为何选 C,语法是怎样的呢?

The boys spent the whole morning _______ possible answers to the question.A.discussB.and discussing C.discussingD.and discussed 为何选 C,语法是怎样的呢?
spend+time+doing sth.花费时间做某事