第一节 单项填空(共15小题;每小题1分,满分15分)
请从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该选项的标号涂黑。
例:A computer
can only do ________ you have instructed it to do.
A. how B.
after C.
what D.
when
答案是C。
21. - Sally, was ________ problem solved?
- We were trying to think of ________ way
out, but it was hard to find one.
A. the; a B.
a; a C.
a; the D.
the; the