[題目] 新多益必考單字600 L7 p.43第14題
頁數: p.43 第14題
題目: When a problem ___ frequently , it is time to reexamine the process.
a. recur b. recurring c.recurrence d.recurs
疑問:
ANS = d
子句裡的動詞不是要去動詞化嘛? Why answer is not c.
Thanks a lot~
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