If ________, please pay a visit to me and have a further discussion of the issue.
A．you are convenientB．it is convenient
C．it at your convenienceD．it is convenience
B

試題分析：句意：如果方便的話，請來看望我，我們對這個問題進行一次更深地探討。at your convenience在你方便的時候，選項C沒有謂語動詞；convenience 是名詞；convenient不能用人做主語，一般需用it做主語，it is+形容詞convenient；故選B。
點評：本題難度適中。固定句式是近幾年的高考的熱點，不僅在單選中考查，還會出現(xiàn)在完形和短文改錯中。
即學即練：I will come when________ to you.
A. you are convenient                  B. it is convenient
C. it at your convenience             D. it is convenience
解析：B。句意：我會在你方便的時候來的。
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