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题型：单选题题类：常考题难易度：普通

山西省曲沃中学校2015-2016学年高二下学期英语期中测试

Exactly ______ the potato was introduced into Europe is uncertain, but it was probably around 1565.

A、whether B、why C、how D、when

举一反三

______ scientists have learned a lot about the universe, there is much we still don't know.

From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.

As it reported, it is 100 years{#blank#}1{#/blank#}Qinghua University was founded.

Frank insisted that he was not asleep ______ I had great difficulty in waking him up.

Tom is so independent that he never asks his parents' opinion _________ he wants their support.

It sounds like something is wrong with the car's engine. ________, we'd better take it to the garage immediately.

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