They enjoyed fresh watermelon last fall because they______ watermelon seeds in the spring.
A．were plantingB．would plant C．have planted D．had planted
D
因為他們?nèi)ツ暝诖禾旆N下了西瓜籽所以秋天他們品嘗到了新鮮的西瓜。根據(jù)句意“種西瓜”是在品嘗之前，而品嘗是過去的事情那么種是在過去的過去所以用過去完成時態(tài)，選D
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