(Who) (has eyes) can see (what great achievements) we (have made) since 1978．（）

单项选择题Skating can be good for you （） correctly.

A．though doing
B．though done
C．if done
D．if doing

单项选择题This is only one of the laundries in the district （） modern equipment.

A．that have
B．which have
C．that has
D．what has