【C16】A．BecauseB．WhenC．BeforeD．Although

【C16】A．whetherB．whenC．whereD．why

【C17】A．IfB．WhenC．BeforeD．As

A．BecauseB．WhenC．WhetherD．If

【C16】A．becauseB．even ifC．sinceD．if

【C3】A．BecauseB．AsC．SinceD．Although

【C5】A．BecauseB．WhenC．IfD．Whether