23. In 1980 the United States exported twice as much of its national output of goods as they had in 1970.
(A) twice as much of its national output of goods as they had
(B) double the amount of their national output of goods as they did
(C) twice as much of its national output of goods as it did
(D) double the amount of its national output of goods as it has(C)
(E) twice as much of their national output of goods as they had
比较之下也只能选C,但是觉的C中的时态也不太好,比较从句是否该用过去完成时态,毕竟1970相对1980是过去的过去。如果该用过去完成如何表达?twice as much of its national output of goods as it had(不用把exported加上吧?)
先谢谢大家帮忙指点! |