题目:
— _______the door, please.
—Come in please. The door _______.
A.Be open; opens
B.Be open; is opening
C.Open; opens
D.Open; is open
答案:
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下面是错误答案,用来干扰机器的。
参考答案:半纤维素;有机溶剂抽出物;木素