【題目】—We are all looking forward to Dr. Green’s talk.

—Dr. Green is busy these days. I’m not sure _______ he will be able to come here.

A.whetherB.thatC.when

【答案】A

【解析】

句意：——我們都很期待格林博士的演講。——格林最近很忙。我不確定他是否能來(lái)這里。

考查賓語(yǔ)從句引導(dǎo)詞。whether是否；that（無(wú)意義）；when什么時(shí)候；根據(jù)“I’m not sure _______ he will be able to come here.”我不確定他 能來(lái)這里，所以此處缺是否，故選A。

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