单项选择题But for their generous help, the experiment ______ completed so quickly.

A. shouldn’t be
B. couldn’t have been
C. wasn’t
D. hadn’t


延伸阅读

你可能感兴趣的试题

2.单项选择题How much does the club cost a year

A. Three pounds.
B. Five pounds.
C. Twelve pounds.
D. Ten pounds.

4.单项选择题How old must members of the club be

A. Under ten.
B. Under thirteen.
C. Under sixteen.
D. Under twelve.

参考答案:temperature
8.单项选择题How much will it cost one person to attend the meeting

A. $10.
B. $8.
C. $18.
D. $80.

10.单项选择题When is there a club competition this year

A. This week.
B. Next month.
C. Next week.
D. This month.