问题补充:
. — We had a good time in the park last Saterday. Pity you weren’t there.
— I really come but I was looking after my mother in the hospital.
A. must
B. ought to
C. need have
D. should have
答案:
A. must
B. ought to
C. need have
(答案→)D. should have
解析:可联系答.案.网客服索取。