The young boy is only fire,but he_to speak English and French.A.can B.can be able C.able D.is able这里为什么要选D?

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Theyoungboyisonlyfire,buthe_tospeakEnglishandFrench.A.canB.canbeableC.ableD.isable这里为什么要选D?Theyoungb

The young boy is only fire,but he_to speak English and French.A.can B.can be able C.able D.is able这里为什么要选D?
The young boy is only fire,but he_to speak English and French.A.can B.can be able C.able D.is able
这里为什么要选D?

The young boy is only fire,but he_to speak English and French.A.can B.can be able C.able D.is able这里为什么要选D?
D.is able
be able to 能够