文法／句型
must + V 表示「對現在事物肯定的推測」。
must + have + p.p. 表示「對過去事物肯定的推測」。
She must be very rich. Look at the diamond necklace she wears.
Something must be wrong. Where is your father?
It must have rained last night. The ground was wet this morning.
He must have hidden the painting somewhere
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