Attimes,parentsfindthatit’sdifficult

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At times, parents find that it’s difficult _______ with their teenage children.

A. talk B. talked

C. talking D. to talk

D 结合选项可知句意为“有时，父母发现与他们的青少年孩子交谈是有困难的”， it’s+adj.+to do sth.为固定句式。故选D。