[題目] Complete Guide (3/e)
書名：Longman
版本：3/e
頁數：p.133 Exercise 5.11 第二題
題目：
The plane was _____ its final approach to the airport when it develped
a problem with its landing gear
(A) made
(B) making
(C) make
(D) makes
疑問：為甚麼是B而不是A
頁數：p.134 第十五題
題目：
I am afraid the train will_______ by the time you get to the platform.
(A) leaving
(B) have left
(C) left
(D) be left
疑問：為甚麼是B而不是D
請指教，謝謝。
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