書名：Longman
版本：4/e
頁數：p.261 第133題
題目：
133. To ensure the health of our employees and customers, the air-conditioning
units need to be serviced _____.
(A) biannually
(B) rarely
(C) usually
(D) seldom
答案是A
疑問：想問為什麼C不行呢？
他後面的解答是寫說：adverbs of definite frequency can appear at the
ends of sentences.
但是這本書P129第五點寫說
Certain indefinite frequency adverbs 可以放在句首或句尾，像是
frequently, generally, occasionally, often, sometimes, and usually.
所以usually應該是可以放句尾？
因此不懂C為什麼不能選呢orz
謝謝！
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