When Peter __________ the car door, he found the key left in his car. So he had to call for help.A.openedB.was openingC.was to openD.had opened
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C解析试题分析：句意：当皮特刚想打开门时，发现钥匙忘在了车里，因此他不得不求助。因为皮特他没有钥匙，想打开门还未打时，表将来，只有be to do 可以表将来，故选C。考点：考查动词的时态的用法。
点评：本题难度适中。动词的时态是高中语法知识点的重难之一，需要考生掌握各种时态的用法，有分析理解复杂的句子结构及语境的能力。即学即练：She said a new bookshop_______ in the high street.A. opened B. was opening C. was to open D. had opened解析：D。句意：她说在商业大街上有新开了一家书店。