请说明选择的理由,1.I had a hard time ------ the key.A.find B.finds C

请说明选择的理由,1.I had a hard time ______ the key.A.find B.finds C.finding D.found2.—Tom plays the violin very well,doesn’t he?—______.A.He plays it B.He thinks so C.He sure does D.He agrees3.—Which park are you going to?—______.A.Good idea B.I’m going to Nanhu Park C.I won’t,either D.It’s too crowded