题目内容
-I don't know ________ he will come or not tomorrow.
-________ he comes, he will call us.
[ ]
A.if, If
B.whether, If
C.when, If
D.when, When
答案:B
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题目内容
-I don't know ________ he will come or not tomorrow.
-________ he comes, he will call us.
A.if, If
B.whether, If
C.when, If
D.when, When