单项选择 This kind of robot will()help people do housework.A.can

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单项选择 This kind of robot will()help people do housework.A.can B.is able to C.could
D.be able to

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正确答案：选D. be able to

即：This kind of robot will ( be able to ) help people do housework.

翻译：这种机器人将能够帮助人们做家务.

解析：be able to 与 can 的区别：

1）can could 表示能力；可能 (过去时用could), 只用于现在式和过去式(could).be able to可以用于各种时态. 如：
They will be able to tell you the news soon.

他很快就能告诉你消息了.
2）只用be able to
a. 位于助动词后.
b. 情态动词后.
c. 表示过去某时刻动作时.
d. 用于句首表示条件.
e. 表示成功地做了某事时,只能用was/were able to, 不能用could.

综上所述,只有D是正确的.

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