问题

Stephen Hawking believes that the earth is unlikely to be the only planet _______ life has developed gradually.

A:that
B:where
C:which
D:whose

正确答案是：

同类题型

You may ______ it that Jennifer will come and help us if we are in trouble.

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e lost in the forest; ______, it becamedark and began raining.

What’s this –It is ___________.

Remember _____the earth, we only have one earth.