问题:
-- May I go out now. Dad?
-- No. You __ let your mother know first.
A.can
B.may
C.need
D.must
-- May I go out now. Dad?
-- No. You __ let your mother know first.
-- No. You __ let your mother know first.
A.can | B.may | C.need | D.must |
参考答案: