SALLY PAID FOR HER TRAVEL IN ADVANCE, BUT IT WASN’T NECESSARY....
Câu 30. Sally paid for her travel in advance, but it wasn’t necessary.
A. Sally couldn’t have paid for her travel in advance.
B. Sally might not have paid for her travel in advance.
C. Sally needn't have paid for her travel in advance.
D. Sally may not have paid for her travel in advance.