If I had _____, I'd go to Africa alone, stopping at all the interesting places. [ ]

A. an enough long holiday

B. a long enough holiday

C. a holiday enough long

D. a long holiday enough

在电力、通信、燃气、上下水等管线（）m范围内挖土时，应采取安全保护措施，并应设专人监护。

A、1

B、2

C、3

D、4