题目内容:
—Michael, shall we go hiking in the mountains next Sunday?
—OK, ________it rains heavily.
A.when
B.until
C.unless
D.if
参考答案:
答案解析:
—Michael, shall we go hiking in the mountains next Sunday?
—OK, ________it rains heavily.
A.when
B.until
C.unless
D.if