—Will you please answer the door? It ________ be your sister.
—Sorry, I ________. I’m feeding the rabbit.
A.must; mustn’t | B.may; can’t | C.will; can’t | D.must; needn’t |
—Will you please answer the door? It ________ be your sister.
—Sorry, I ________. I’m feeding the rabbit.
A.must; mustn’t | B.may; can’t | C.will; can’t | D.must; needn’t |