the girl doesn't look like Grace at all .she ( )be her sisiter .a.must b .can't c.wouldn't

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the girl doesn't look like Grace at all .she ( )be her sisiter .a.must b .can't c.wouldn't

B
情态动词表推测
can't 在这里是不可能

b 肯定的猜测用must 否定的猜测 用can't wouldn't  以过去时间为参照 表示将不会发生