问题
选择题
The police still haven’t found her, but they’re doing all they _____.
A．may
B．can
C．must
D．will
答案
答案：B
do all one can 意为“尽力”或“竭尽全力”。
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The police still haven’t found her, but they’re doing all they _____.
A．may
B．can
C．must
D．will
答案：B
do all one can 意为“尽力”或“竭尽全力”。