The police still have not found the lost child, but they’re doing all they______

游客2024-01-14 30

问题 The police still have not found the lost child, but they’re doing all they___________.

选项 A、can
B、may
C、must
D、should

答案 A

解析考查情态动词。句意：警察仍未找到那个丢失的孩子，但是他们正在竭尽所能地寻找。all之后的they can(do)作为定语从句修饰先行词all ，其定语从句引导词that已被省略。从句中can表示“能够”，符合句意。may“可能”；must“一定”；should“应该”，均不符合语境，故选A。

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