Since I began to work here three years ago, this factory ______ in size. A: [A] had doubled B: [B] has doubled C: [C] doubled

The _______ production of engines in our factory has doubled this year.

In the last two decades world production of electricity has roughly doubled, with the developing nations _______ the developed.

The town's ______ has doubled in the past ten years. A: comment B: research C: population D: average

The population of our country has ______ doubled in the past three years. A: larger than B: more than C: as great as D: as many as

The population of many Alaskan cities has ______ doubled inthe past three years. A: larger than B: as great as C: more than D: as many as

下面赋值语句不正确的是()。 A: floatf=11.1； B: doubled=5.3E12； C: doubled=3.14159； D: doubled=3.14D；

The output of television sets has （） in the past five years. A: more than doubled B: more than double C: as many as double D: as much as double

The average income of the people in this small town is ______ in the past three years. A: [A] more than doubled B: [B] more doubled than C: [C] much than doubled D: [D] much doubled than

By the end of this century, the population of the world ______ , and so may the population of the small country. A: will be doubled B: may be double C: will have to be doubled D: may have been doubled