He knows it is high time that he ________ at once.
A．quits smokingB．quitted smoking
C．should quit to smokeD．quitted to smoke
B
本題考查虛擬語氣及動詞用法。it is high time that + 主語 + 過去時態(tài)/should + v原形；quit doing 放棄做。故選B。
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