皮皮学，免费搜题
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【单选题】
“童言无忌”从儿童心理学的角度看是A.
儿童心理落后的表现
B.
符合儿童年龄特征的表现
C.
“超常”儿童的表现
D.
父母教育不当所致
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
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【简答题】从计算机的角度讲,计算科学的本质就是 。
【单选题】Look! the ground is wet. It must have rained last night, _______?
A.
hasn’t it
B.
didn’t it
C.
mustn’t it
D.
hadn’t it
【单选题】Look! The ground is wet. It must have rained last night, ________？
A.
hasn't it
B.
hadn't it
C.
mustn't it
D.
didn't it
【单选题】-The ground is wet. -It must have rained last night,_____? [ ]
A.
hasn't it
B.
didn't it
C.
mustn't it
D.
isn't it