题目内容
-I don't know ________ we will visit the robot exhibition tomorrow.
-We will ________ it rains or it is very hot.
[ ]
A.if; if
B.when; since
C.how; until
D.whether; unless
答案:D
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题目内容
-I don't know ________ we will visit the robot exhibition tomorrow.
-We will ________ it rains or it is very hot.
A.if; if
B.when; since
C.how; until
D.whether; unless