Question

—Where is my pen?
—I _________ it on the desk, but I don’t know who _________ it away.

A．put; has taken

B．put; took

C．have put; took

D．have put; has taken

Answer 1

A

考察時態。句意：我的鋼筆在哪兒？——我放在桌子上了，但是我不知道誰拿走了它。可知前文敘述的是過去發生的動作，下文強調已經完成的動作，故前文用過去時態，下文用完成時態。Put過去時與原形一樣，故選A。