【題目】If ______ to look after luggage for someone else, inform the police at once.
A.asked
B.to ask
C.asking
D.having asked

【答案】A
【解析】句意:如果被要求給別人照看行李,立刻通知警方。 從語境中可知這里是被要求,當(dāng)從句中的主語和主句主語一致時,且從句中有謂語動詞,此時可以省略從句中的主語和謂語動詞。此句中,主句為祈使句,主語為you,從句中省略了you are。故選A。

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