Not until the early years of the 19th century______ what heat is.

下列各句括号中补出的省略成分,不正确的一项是

The beef is too expensiveI won’t buy it _____

always true that sometimes evenif you have had a big dinner, _________ are that you will still want to reachfor food when it gets late．

Jason got 60 in the math test. What about you—I did ____ than him. I didn’t pass it.