??? 情景例句
What grade are you in?
你在幾年級(jí)？
What may be done at any time will be done at no time.
在任何時(shí)候都可做的事情，總是在任何時(shí)候都不做的事情。
George showed me to the guestroom which, he said, was rarely used.
喬治把我領(lǐng)進(jìn)客房，說這間很少使用。