The Smiths went to the country for the weekend as they to the office.
A. needn’t have gone
B. mustn’t go
C. may not go
D. didn’t have to go
网友回答
A. needn’t have gone
B. mustn’t go
C. may not go
(答案→)D. didn’t have to go
解析：此句要表达的意思是：史密斯一家因为不必去办公，所以去了乡下度周末。A中时态与主句搭配错误，B中mustn't表示“禁止”，C项意为“也许不”，与句意不符。 D项正是表达“不必”的意思，所以D项正确。