问题
What are you doing now, my dear— Doing my homework. We always have lots of homework _____ .
A:doing
B:do
C:does
D:to do;
B:do
C:does
D:to do;
正确答案是：
同类题型
His son never calls him _____to ask for money.[ ]
Look, what have they done —Sorry. I think ifI __________ another chance, I’ll do it better.
Vitthis special chemical，________，affects our brains，making us feel happy.
untry’s population ______ small, andmost of its population ______ in the mountainous areas