The other timing system belongs in our internal clocks，which，left ________，would tie the body to a 25-hour rhythm.
B
译文：更不用说，另一个定时系统在我们的人体时钟内，它会使人保持在一个25小时的生理节奏上。此题考查关于leave的短语。leavebehind意为“留下，放弃”，leavealone意为“更不用说”。leaveout意为“遗漏，忽视”。
By"languageacquisitionisprimarilytheacquistionofthegrammaticalsystemoflanguage",linguistsmeanthat______.
Hesaidthatthegroup________himaletterandaskedhimtogothereforaninterview.
Johnson was ________ unknown before running for the presidency.