29. By the time Eric arrived at the airport, the airplane ______ for ten minutes.
(A) leaves
(B) left
(C) has left
(D) had left

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統計： A(4), B(3), C(17), D(118), E(0) #805396

詳解 (共 1 筆)

#1416664
[ By the time ]引導的子句可以描述過去，主要子句要用過去完成式。
EX.  By the time I finished my homework, my young brother had gone to bed.
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