【題目】The boy was so weak that he________ move by himself.

A. was able to B. was unable to

C. is not able to D. was disabled to

【答案】B

【解析】

句意：那個男孩如此虛弱以至于他自己不能移動。be able to 能；be unable to 不能。根據(jù)主句時態(tài)是過去時態(tài)，所以從句用過去時態(tài)，結合句意，故選B。

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