Which do you enjoy _to spend_your spare time__（度過你的空閑時間）, playing cards at home or taking a walk in the park?

可以理解正確答案是：不定式做目的狀語。但為何不能填spending 呢？

You enjoy spending your spare time in playing cards at home ortaking a walk in the park.如此不可以么？

Which do you enjoy to spend your spare time, playing cards at home or taking a walk in the park?

—— 這個句子錯誤百出，不可思議。

改為：

Which do you enjoy spending your spare time in, playing cards at home or taking a walk in the park?

【注】which 表示選擇，指：playing cards at home or taking a walk in the park，需要加介詞 in，需要做句子成分，不然被架空。

【答語】

（1）I enjoy spending my spare time in playing cards at home

（2）Ienjoy spending my spare time in taking a walk in the park.

所以，網(wǎng)友這個句子沒錯。

You enjoy spending your spare time in playing cards at home ortaking a walk in the park.