The police still haven’t found the lost child, but they’re doing all they             .
A．canB．mayC．mustD．should
A
本題考查情態(tài)動詞。can表能力。do all（that）one can意為：“竭盡全力”。句意為：“雖然警察仍未找到那個失蹤的孩子，但他們正竭盡所能。”
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